Use the correct form of the verb (active or passive). слова, которые нужно изменить, в скобках. in 1796, british physician edward jenner (1) (inoculate) a young boy with the smallpox (оспа) virus and (2) (show) that the boy then (3) (become) immune to the smallpox virus. the success of his experiment at a time when many (4) (die) of smallpox, (5) (celebrate) as a miracle. this approach, called vaccination or immunisation, then (6) (become) the subject of major scientific and clinical research. immunisation (7) (be) now an important part of preventive medicine, especially in offering protection from diseases for which there are as yet no effective treatments. vaccines are available against many viral and bacterial diseases. due to the current aids (acquired immune deficiency syndrome) crisis, scientists (8) increasingly (look) toward vaccination as a means against it. viruses (9) (present) a special challenge to medical treatment. traditional vaccines (10) (consist) of either the weakened or the heat-killed virus proteins. while such vaccines (11) (be) quite successful against some infections, they fail to cope with others. the problems in traditional immunisation (12) (sparkled) interest in new and improved vaccine models. researchers now can insert a gene from a pathogen (возбудитель инфекции) into a piece of dna. when this (13) (inject) into tissues, a protein that (14) (stimulate) an immune response (15) (produce). this immune response is unique and in some ways superior to that produced by traditional vaccines.

In 1796, British physician Edward Jenner inoculated a young boy with the smallpox virus and showed that the boy then became immune to the smallpox virus. The success of his experiment, at a time when many were dying of smallpox, was celebrated as a miracle. This approach, called vaccination or immunization, then became the subject of major scientific and clinical research.

Immunization is now an important part of preventive medicine, especially in offering protection from diseases for which there are as yet no effective treatments. Vaccines are available against many viral and bacterial diseases. Due to the current AIDS (acquired immune deficiency syndrome) crisis, scientists are increasingly looking toward vaccination as a means against it.

Viruses present a special challenge to medical treatment. Traditional vaccines consist of either the weakened or the heat-killed virus proteins. While such vaccines are quite successful against some infections, they fail to cope with others. The problems in traditional immunization have sparked interest in new and improved vaccine models.

Researchers now can insert a gene from a pathogen into a piece of DNA. When this is injected into tissues, a protein that stimulates an immune response is produced. This immune response is unique and in some ways superior to that produced by traditional vaccines.

Now let's look at the verb forms in the given text and decide whether they should be in the active or passive voice:

1. (inoculate) - This verb should be in the active voice: "inoculated." Here, it refers to the action Edward Jenner performed on the young boy.

2. (show) - This verb should also be in the active voice: "showed." This refers to the action performed by Edward Jenner, demonstrating the result of the inoculation.

3. (become) - This verb should be in the passive voice: "became." The boy is the one receiving the action of becoming immune to the smallpox virus.

4. (die) - This verb should be in the active voice: "died." Here, it refers to the action of many people dying from smallpox.

5. (celebrate) - This verb should be in the passive voice: "celebrated." The success of the experiment was celebrated by others.

6. (become) - This verb should be in the active voice: "became." Here, it refers to the process of vaccination becoming the subject of major research.

7. (be) - This verb should be in the present simple tense and the passive voice: "is." It refers to the current status of immunization as an important part of preventive medicine.

8. (look) - This verb should be in the present continuous tense and the active voice: "are increasingly looking." Scientists are the ones performing the action of looking toward vaccination as a means against AIDS.

9. (present) - This verb should be in the present simple tense and the active voice: "present." Here, it refers to the viruses being a challenge to medical treatment.

10. (consist) - This verb should be in the present simple tense and the active voice: "consist." It refers to the content or components of traditional vaccines.

11. (be) - This verb should be in the present simple tense and the active voice: "are." This refers to the success of traditional vaccines against some infections.

12. (sparkled) - This verb should be in the past simple tense and the active voice: "sparked." It refers to the action of traditional immunization raising interest in new vaccine models.

13. (inject) - This verb should be in the present simple tense and the passive voice: "is injected." Here, it refers to the action of injecting the gene and the piece of DNA into tissues.

14. (stimulate) - This verb should be in the present simple tense and the active voice: "stimulates." It refers to the action of the protein stimulating an immune response.

15. (produce) - This verb should be in the present simple tense and the active voice: "produces." It refers to the action of the immune response being produced by the protein.

I hope this detailed explanation helps you understand the verb forms and their usage in the given text.