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The police still haven’t found the lost child, but they’re doing all they       .

-- I can’t believe that Jeff _______ have quarreled and fought with his boss.
-- Well, if one _______ ask for trouble, it just can’t be helped.

— Could you give me a ride to the railway station? I’m going to be late.
— I’ll take the nearest route. You ________ be in time for the train.

—Isn’t Ann’s husband over there?
—No, it _____ be him — I’m sure he doesn’t wear glasses.

–Can I get out at noon?
--No. Our school rules state that no student ____ be allowed out at noon, unless he has a request form.

The first snow of every year is always so exciting, but too much snow _________ cause trouble

— What does the sign over there say? 
— No person _________ bring drinks into the student computer room.

It is important to know about the cultural differences that        cause problems.

— She looks rather upset. She        the exam.
— I guess so. It’s very difficult after all.