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__ carefully if any change occurs when doing experiments in the lab..

A．Observe	B．To observe
C．Observed	D．Observing

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Young kids! You'd better apologize to us，or we________the right to accuse you of cheating.

A．reserve

B．preserve

C．observe

D．deserve

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To be honest，it is Jack as well as his two classmates that________for the broken vase.

A．is to blame

B．is to be blamed

C．are to be blamed

D．are to blame

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Jack has been working hard these days.It's obvious that there is ________he is eager for but didn't mention to us.

A．anything

B．something

C．nothing

D．everything

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The old man went near ________office.Unluckily，there was no name on________door.

A．an；\

B．the；the

C．an；the

D．the；a

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He changed so much that only when I looked closely________he was exactly my long lost friend.

A．I realized	B．did I realize
C．I did realize	D．realized I

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