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1. 
Why didn’t you help him? You ___ have done it.
A.
could
B.
can
C.
must
2. 
. A: ___ I phone you tonight? B: Yes, you ___ .
A.
must / might
B.
may / may
C.
could / can’t
3. 
But I ___ stay in England for six months, and not for a fortnight as I had planned.
A.
may
B.
had to
C.
must
4. 
-I ___ draw a circle with a pencil only, and you? -Neither can I.
A.
may
B.
can
C.
can’t
5. 
Last week I ___ go to town on business trip as the Ministry of Education had asked me to come.
A.
had to
B.
have to
C.
should
6. 
If one person is careless with a library book, then it ___ be read by others.
A.
can
B.
couldn't
C.
can’t
7. 
After a book is written, it passes through the heads of very many different workers. Each worker works carefully, for there ___ not be any mistakes.
A.
must
B.
could
C.
might
8. 
People who know a foreign language ___ learn a second one easily.
A.
can't
B.
can
C.
could
9. 
. ___ I have a word with you, please?
A.
may
B.
must
C.
could
10. 
He tried, but ___ persuade nobody.
A.
can
B.
could
C.
should