二、用所给词的适当形式填空。
1.What ________ Maria ________ (do)
when the teacher came in?
2.While the alien was in the museum,I ________ (call) the TV station.
3.I ________ (watch)TV at that time.
4.When the UFO arrived I was ________ (get)out of the shower.
5.The children ________ (leave)school on Tuesday when they saw a truck.
6. ________ you ________ (talk)with your friend at nine o'clock yesterday morning?
7.He said he ________ (return)soon.
8. ________ (see)is believing.
9.I wanted to know what ________ (happen)there.
10.Look!They ________ (look)after the twins.