30.Theproblemliesinthemistmayb

30.The problem lies in ______ the mist may become a thick fog , making the situation even worse.

A．that

B．which

C．what

D．that whether

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__________ I went to the seaside, I picked up a great many shells.

A．For the first time	B．At first
C．By the first time	D．The first time

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The reason _____ he didn’t go to the party was _______ his mother was in hospital.

A．why; that	B．that ; that
C．which, that	D．why; because

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The little girl showed no anxiety before the competition. She seemed ______ for it pretty well.

A．to prepare	B．having prepared
C．to be preparing	D．to have prepared

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__________ hard, and you will succeed in time..

A．Working

B．Work

C．Worked

D．To work

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-- Hi, Grace, you look tired.
-- I'm tired. I ____________________ on my homework all day.

A．worked	B．had worked
C．have been working	D．have worked

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