III. Chọn một đáp án đúng trong số A, B, C hoặc D để hoàn thành mỗi câu sau.
16. When you
last night, I
A rang/have worked
B. rang/ worked
C. were ringing
D. rang/ was working
17. Nam went to party yesterday,
?
C. do they
A. didn't he
B. did they
18. Among all, I think English grammar is
A. difficult
B. more difficult
in the garden, so I didn't hear the phone
D. didn't he
C. most difficult D. the most difficult