Пишу только ответы, стоят в правильной форме:
1 get
2 slept
3 have
4 is your brother a teacher
5 became
6 didn't understand
7 do you go to the theater
8 go
9 sleep
10 slept
11 walk
12 took
13 bought
14 didn't buy
15 sold
16 I don't know
17 is
18 are
Прости что поздно дала решение ;)