The accident happened on such an evening with strong winds ________ by heavy rain．

A．appeared

B．struck

C．accompanied

D．mixed

Snorkeling trips are great fun but they ________ be very dangerous underwater．

A．can

B．must

C．shall

D．will

A firm from New Zealand has revealed a set of robotic legs which they claim will soon allow ________ wheel chair - bound people to walk again．

A．originally

B．previously

C．properly

D．primarily

________, some students tend to develop a range of unhealthy habits．

A．Parents don't watch over them

B．Not having watched over

C．With no parents to watch over them

D．Parents watched over

The woman, who is said to have moved to America, ________ in China for almost twenty years．

A．lived

B．has lived

C．was living

D．had lived

With ________ successful launch of Tiangong-1, which was ________ breakthrough in this field, China's space dream took a step closer to reality．

A．the; a

B．a;/

C．a; the

D．the;/,

Before I gave my name he ________ , which made me very angry．

A．rang off

B．got through

C．rang back

D．hung on

Mike ________ in touch with his former schoolmates, who had been living there for ages, as soon as he arrived in America．

A．is bound to get

B．set about getting

C．get down to get

D．set out getting

Occasions are quite rare ________ I have the time to spend a day with my kids．

A．who

B．which

C．why

D．when

The engine of the bus was ________ ，and the bad weather added to the worries of the passengers．

A．in vain

B．in good condition

C．out of work

D．out of order