Question

19.Nobody knows how people first came to these islands.they..............have sailed from South America.
D. had
A. might
C. should
B. must
20. She felt ill and
leave early.
C. had to
D. ought
A. has to
B. must

Answer 1

1, might

2, had to

Answer 2

19.A

20. A

Answer 3

A

C

Answer 4

19.Nobody knows how people first came to these islands.they..............have sailed from South America.
D. had
A. might
C. should
B. must
20. She felt ill and
leave early.
C. had to
D. ought
A. has to
B. must