Język angielski proszę o pomoc w zadaniu 5!!!

Odpowiedź:
1 took
2.started
3.got
4. arrived
5. were already waiting
6. were reading
7.were chatting
8.was
9.went
10. was drawing
11. was sitting
12. was still answering
13.opened
14.had
15.felt
16.were
17.revised
18.went
19.left
20.announced
21.heard
22.managed
Wyjaśnienie: