According to the rules, all drivers ________ this traffic accident are to be taken to the police station to make their statements．

A．sensitive to

B．relevant to

C．accessible to

D．due to

The hospital operates well, ________ many wounded ________ every day．

A．where, are operated

B．where, are operated on

C．which; are operated

D．which; operates on

The doctor recommend he ________ a few more days in hospital．

A．stays．

B．to stay

C．stay

D．would stay

He made another wonderful discovery, ________ of great importance to science．

A．which I think is

B．which I think it is

C．which I think it

D．I think which is

Having a walk after supper is certainly good for the old people, but it remains ________ whether they will enjoy it．

A．to see

B．to be seen

C．seeing

D．seen

Cheer up, Maria! You can also enjoy ________ you have been dreaming of, if you don't lose heart．

A．as a convenient life as

B．as convenient a life as

C．as a life convenient as

D．convenient as a life as

When I met him the other day, it was the first time we ________ each other since we were at school．

A．saw

B．had seen

C．were seeing

D．have seen

With the guide ________ the way, we finally got to the village which we were looking for．

A．led

B．leading

C．to lead

D．had led

In the dark street, there wasn't a single person ________ she could turn for help．

A．that

B．who

C．from whom

D．to whom

People like taking photos because photos are the ________ of youth and history and can remind us of many happy scenes．

A．witness

B．guidance

C．evidence

D．approval