He found it hard ______ his class.[ ]A. to catch up withB. to catch upC. cat

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He found it hard ______ his class.[ ]
A. to catch up with
B. to catch up
C. catch up with

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举一反三

I have been studying for two hours.  Can I stop _______and play computer games for a while?           [     ]
A. to have a rest
B. having a rest
C. to having a rest
D. have a rest

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We can’t afford ______ such an important customer. [ ]
A. upset
B. to upset
C. upsetting

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Mr Green has enough houses for us _____.[     ]
A. live
B. to live
C. living
D. to live in

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Tomorrow"s meeting is very important. Please ask them ______ there on time.[     ]
A. go
B. going
C. to go
D. went

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I  hope ________you soon.          [     ]
A. to see
B. see
C. seeing
D. saw

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