—What’sthematterwithyou?Youloo

—What’s the matter with you? You look so worried.
-- I don’t know ___________ the problem.

A．what to solve

B．how to solve

C．to solve what

D．how can I

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Schools don’t allow ______ answers in the exam.

A．copy	B．to copy
C．copying	D．copied

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A．to, as	B．for , as
C．as, to	D．to, for

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An accident______ on this road last week.

A．has been happened	B．was happened
C．is happened	D．happened

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A．work	B．working
C．to work	D．to be working

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A．you open	B．your open
C．your opening	D．yours opening

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