十道英语题求解！！！急急急！！！

为你解答。
1、did you buy
2、were talking
3、was doing
4、were watching
5、is dancing
6、What were you doing at three o'clock yesterday afternoon?
7、Was Kate reviewing her lessons at eight last night? Yes, she was.
8、B
9、D
10、C

did you buy
were talking
was doing
were watching
is dancing
What were you doing at three o'clock yesterday afternoon?
Was Kate reviewing her lessons at eight last night?
B
D
C

have you bought
were talking
had been doing
were watching
is dancing
What were you doing at three o'clock yesterday afternoon?
Was Kate reviewing her lessons at eight last night? Yes, she was.
B D C

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buying