7) Fill in can, may, be able, must, should, ought, have to, be to in the appropriate form. 1. Manufacturers ... enrich their assortments of ice cream regularly if they want to stay in business since competition in ice cream production is very strong.
2. Ice cream ... be stored for several months if it is kept below 20°C.
3. Microbiological tests... be carried out for all frozen desserts before their delivery to consumers.
4. The overrun for ice cream and ice milk... be about 65 to 100 percent.
5. Mellorine... be produced in places where butterfat prices are higher than vegetable fat ones.
6. According to standards sherbets... contain about 2 percent milk fat and 5 percent total milk solids.
7. All sherbets... be sold either in hard or soft frozen form.
8. Concentrated milk products ... be easily diluted by a less concentrated form of milk.
9. Such characteristics as fine flavour, smooth texture, optimal overrun ... be ensured by manufacturers.
10. The new equipment... be adjusted again. It... have been mishandled by the worker.
11. By agreement with the production manager's office, the development of the new ice cream recipe ... be completed in a month.
12. The development of the new ice cream recipe ... be completed in a month, otherwise the factory will not... to start producing the new product by the summer season.
13. Before introducing new flavours the company... to carry out market research and study the demand for its competitors' products.
14. Milk ices ... have first been made in the Far East.
15. Ice cream ... not become widespread product before mechanical refrigeration came into being.
16. Rather warm climate with long hot summers on the major part of the US territory ... have stimulated the development of frozen desserts in the country.
17. For dietetic reasons, low-fat products... to be substituted for products made of whole milk and cream.
18. Russian manufacturers ... develop diabetic frozen desserts as the latter are practically absent at the Russian market. .
19. Dairy products... provide a lot of essential nutrients for man. .
20. The patient asked the doctor if he ... eat products containing sugar or if he ... still keep to the sugar-free diet.

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