Rainforests ________ and burned at such a speed that they will disappear from the earth in the near future．

A．cut

B．are cut

C．are being cut

D．had been cut

________ the rain falling so hard, it becomes more and more difficult to carry on the rescue work．

A．Since

B．As

C．With

D．For

At a beach or a swimming pool a lifeguard is a person who is responsible for ________ other swimmers and protecting them from accidents．

A．turning to

B．watching over

C．watching out

D．digging out

The factory produces half a million pairs of shoes every year, 80％________ are sold abroad．

A．of which

B．which of

C．of them

D．of that

Her valuable advice ________ to be taken, or you will suffer more loss．

A．deserves

B．survives

C．serves

D．proves

I will be away for at least one year and I'd appreciate ________ from you now and then．

A．having heard

B．hearing

C．heard

D．hear

Hearing the boring news, I was too distracted(心烦意乱)to ________ my attention on my homework．

A．attract

B．draw

C．concentrate

D．pay

Tom was ________ that he couldn't understand ________ difficult sentence．

A．so a stupid boy; such

B．a so stupid boy; a such

C．so stupid a boy; a such

D．so stupid a boy; such a

Who else except a millionaire could ________ to use such an expensive car．

A．pay

B．spend

C．buy

D．afford

The cost of living in Glasgow is among the lowest in Britain, ________ the quality of life is probably one of the highest．

A．since

B．when

C．as

D．while