Chia động từ

----- Nội dung dịch tự động từ ảnh -----
16. On arriving at home I ..... (find) that she just
(leave) a few
minutes before.
17. When we
(arrive) in London tonight, it probably.....
... (rain).
.. (rain) hard. We can't do anything until it
(stop)
19. Last night we
(watch)TV when the power
.... (fail).
20. That evening we ..... (stay) up to talk about the town where he
(live) for some years.