Mr Black is a careful and experienfed engineer, so he is often ________ to finish some challenging tasks．

A．appreciated

B．approached

C．appointed

D．agreed

China is a peace-loving country and ________ no circumstances ________ first use nuclear weapons．

A．on; will China

B．on; China will

C．under; will China

D．under; China will

In the past decades, sea ice ________ in the Arctic as a result of global warming．

A．had melted

B．has been melting

C．melted

D．is melting

In our country the cold weather in the north ________ sharply ________ the hot weather in the south．

A．combines; with

B．relates; to

C．compares; with

D．contrasts; with

________ of danger in the street at night, she had to go home, with a friend ________ her．

A．Warned; accompanied

B．Warning; accompanying

C．Having warned; accompanied

D．Having been warned; accompanying

I don't doubt ________ he will pass the exam．

A．whether

B．that

C．when

D．how

The problem of global warming is serious．________ , the sea levels have ________ a little．

A．As a consequence; risen

B．On the contrary; arisen

C．On the other hand; arisen

D．In other words; risen

Though ________ money, his parents managed to send him to university．

A．lacked

B．lacking

C．lacking of

D．lacked in

It was a really ________ experience．Afterwards everybody was very ________．

A．terrifying; shocking

B．terrified; shocking

C．terrifying; shocked

D．terrified; shocked

The enemy took ________ control of the city．In other words, all the city was under ________ control of the enemy．

A．the; the

B．the; \

C．\; the

D．a; the