IV. Раскрыть скобки и употребить одно из времен Continuous.
1. I (to talk) over the telephone, when she entered the room.
2. They (to watch) TV while their mother (to cook) dinner.
3. Where is the teacher? – He (to ask) questions now.
4. The engineers (to test) a new machine the whole day tomorrow.
5. Listen! Someone (to knock) at the door.