As Jack left his membership card at home, he wasn't allowed _____ into the sports club.
A. going
B. to go
C. go
D. gone
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They found it difficult ____ the task in such a short time.
A. finishing
B. to finish
C. finished
D. to have finished
It is against my principles _____ with them.
A. to collaborate
B. collaborating
C. collaborated
D. to be collaborated
There're so many kinds of tape-recorders on sale that I can't make up my mind _ to buy.
A. what
B. which
C. how
D. where
-Have you decided when _____?- Yes, tomorrow morning
A. to leave
B. to be leaving
C. will you leave
D. are you leaving
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