Children under 12 years of age in that country ________be under adult supervision when in a public library．

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Who is the girl standing over there？

Well，if you ________know, her name is Mabel．

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Mr White ________at 8∶30 for the meeting，but he didn't show up．

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I often see lights in that empty house．Do you think I ________report it to the police？

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You________ be tiredyou've only been working for an hour．

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Isn't that Ann's husband over there？

No，it ________be him-I'm sure he doesn't wear glasses．

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It was not until________ that ________to study English．

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A．he came to Beijing，he began

B．did he come to Beijing，he began

C．he come to Beijing，did he begin

D．did he come to Beijing，did he begin

It was careless of you to have left your new bike outside all night．

My god！________．

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The mayor of Beijing says that all construction work for the Beijing Olympics ________by 2006．

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A．has been completed

B．has completed

C．will have been completed

D．will have completed

The teacher，with 6 girls and 8 boys of her class，________visiting a museum when the earthquake struck．

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