________ environmental damage is done, it takes many years for the ecosystem(生态系统)to recover．

A．Even if

B．If only

C．While

D．Once

Whenever he was asked why he was late for class, he would answer carelessly, always ________ the same thing．

A．saying

B．said

C．to say

D．having said

The owner of the cinema needed to make a lot of improvements and employ more people to keep it running, ________ meant spending tens of thousands of pounds．

A．who

B．that

C．as

D．which

－It took me ten years to build up my business, and it almost killed me．

－Well, you know what they say．________．

A．There is no smoke without fire

B．Practice makes perfect

C．All roads lead to Rome

D．No pains, no gains

Although medical science ________ control over several dangerous diseases, what worries us is that some of them are returning．

A．achieved

B．has achieved

C．will achieve

D．had achieved

The committee is discussing the problem right now．it will ________ have been solved by the end of next week．

A．eagerly

B．hopefully

C．immediately

D．gradually

－Are you going to have a holiday this year?

－I’d love to．I can’t wait to leave this place ________．

A．off

B．out

C．behind

D．over

This new model of car is so expensive that it is ________ the reach of those with average income．

A．over

B．within

C．beyond

D．below

－I don’t suppose the police know who did it．

－Well, surprisingly they do．A man has been arrested and ________ now．

A．has been questioned

B．is being questioned

C．is questioning

D．has questioned

My most famous relative of all, ________ who really left his mark on America, was Rob Sussel, my great-grandfather．

A．one

B．the one

C．he

D．someone