Điền thì đúng cho câu

----- Nội dung dịch tự động từ ảnh -----
11. Last night I (drop)
a plate while I (do)
the washing up.
Fortunately, it (not/ break)
12. Most secondary school pupils often (attend)
class at 7:30 A.M and (leave)
school for home at 11:15 A.M.
13. Melvin (take)
a photograph of me while I (not/ look)
14. Keep your voice down, please. The president (make)
a speech.
15. The doorbell (ring)
while Tom (watch)
television.
16. The letter (come)
a few days ago?
17. The lights (go)
out while we (have)
dinner. But it
on again after about ten minutes.
NTRE
18. The moon (move)
around the earth in about 27 days.
19. What you (do)
this time yesterday? - I (work)
on the computer.
20. When I (see)
them, they (try)
to find a new house near their work.