Ex. B
1) did you go
2) spoke
3) gave
4) watched
5) wasn't
6) studied
7) had
8) ate
9) didn't do
10) made
ex. C
1) When did he buy that bike?
2) Where did the tourists have dinner?
3) Did he like Italian food?
4) Where did they play computer games?
5) Was the hotel very good?
ex. E
1) had
2) does your sister do, meets
3) did his brother come, didn't come, was busy
4) do you get, slept
5) do you have
6) are your brother, became
7) didn't understand
8) do you go, go
9) sleeps, slept
10) walk, took
11) did she buy, didn't buy
12) did they sell, don't know
13) is, ate
14) did you leave
15) are they