单项选择

　　1. —I’m sorry, but the manager isn’t here yet. Shall I have him call you when he comes back?

　　—No, I’ll call him later. If I call again in half an hour, do you think he ______?

　　A. arrives

　　B. has arrived

　　C. will arrive

　　D. will have arrived

　　2. Tell John not to leave the house unless he ______ that the lights ______.

　　A. will make sure; turn off

　　B. makes sure; are turned off

　　C. will make sure; will turn off

　　D. makes sure; will be turned off

　　3. —Is there any possible way to help the children get rid of such a bad habit?

　　?To be honest, it’s very hard, but we ______ on this problem.

　　A. work

　　B. worked

　　C. are working

　　D. were working

　　4. —I hear you ______ at Smith’s.

　　?Yes, I ______ there for about three months.

　　A. work; had been working

　　B. worked; was working

　　C. are working; have been working

　　D. worked; have worked

　　E. 5. You really need to go out and get some fresh air and sunshine. You ______ overworking during the last two weeks.

　　A. have been

　　B. were

　　C. had been

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