. Put questions to the following sentences. 1. He will be busy with his research work. (general)
2. The scientists obtained new laboratory equipment. (What)
3. You must switch on the apparatus in time. (When)
4. We were taught how to handle these instruments. (Who)
5. The students have to study a lot of material. (Why)

3. Open the brackets.
1. The engine (not to function). It must (to repair).
2. We (to repeat) the experiment next month.
3. Our engineers (to put) the engine in motion yesterday.
4. They (to report) on the results of their observations by 10 o’clock
tomorrow.
5. This area (to explore) by the scientists for several months last year

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