But for the heavy traffic, the police ________ the thieves who tried to escape in the stolen car．

A．would not catch

B．couldn't have caught

C．haven't caught

D．couldn't catch

The cost of renting a house in central Kunming is higher than ________ in any other area of the city．

A．that

B．this

C．it

D．one

Emergency line operators must always ________ calm and make sure that they get all the information they need to send help．

A．grow

B．stay

C．appear

D．become

Mary is so wet．She ________ in the rain．

A．must be caught

B．must have been caught

C．should have been caught

D．can have been caught

I think my friend Tony is ________ to win the tennis game next Monday．

A．likely

B．possible

C．probable

D．maybe

Not only ________ interested in football but ________ beginning to show an interest in it．

A．the father himself is; all his children are

B．the father himself is; are all his children

C．is the father himself; are all his children

D．is the father himself; all his children are

We ________ such great achievements without your efforts．Thanks a lot．

A．can't have made

B．couldn't have made

C．were unable to make

D．are unable to make

A study ________ in the USA in 1977 showed that the chemical ASA in aspirin could prevent a stroke．

A．carrying out

B．carried out

C．working out

D．worked out

It's obvious that the Beijing Olympic Games ________ a great success．

A．kept

B．showed

C．proved

D．remained

Scientists ________ thousands of chemicals before they decided on the right one in the end．

A．tried out

B．found out

C．worked out

D．turned out