causedtheaccidentisstillacompl

_______caused the accident is still a complete mystery.

A．What

B．That

C．How

D．Where

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The accident that happened at an oilfield __________ the southeast coast of the USA has caused great damage to the environment.

A．away	B．from
C．off	D．beyond

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The project alongside with the experiment we had once devoted so much time __________ perfectly.

A．to work out	B．to working out
C．to worked out	D．has worked out

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-Were you busy last week-end?
-Very. Rather than __________ time playing cards as usual, I devoted every effort to __________ an advertisement.

A．waste; design	B．wasting; designing
C．to waste; design	D．a waste of; designing

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__________ to improve the students' sight, the eye exercises are done in schools nation-wide.

A．Being designed	B．To design
C．Designing	D．Designed

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Our hotel is a four-star hotel, which is located __________ Beihai Park __________ Beijing.

A．in; on	B．at; off
C．near; in	D．off; in

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