Помогите пожалуйста с домашкой по английскому(9 класс).
Очень благодарен заранее.

1was having
2wanted
3saw.stopped.had
4had been walking walking.
5read
6didn't enjoy
7saw.had.didn't look
8had travelled
9had cleaned
10had finished
11was playing
12liked
13understood.had explaied
14what was he saying....
15had been sitting
16opened.found.had already taken
17had already built
18was discussing
19arrived.were having
20saw.was trying