In ________ review of 44 studies, American researchers found that men who ate six key foods daily cut the risk of ________ heat disease by 76％．

A．a; the

B．the; a

C．a;/

D．/; a

The computer system ________ suddenly while he was searching for information on the Internet．

A．broke down

B．broke out

C．broke up

D．broke in

As the busiest woman in Norton, she made ________ her duty to look after all the other people's affairs in that town．

A．this

B．that

C．one

D．it

－I knocked over my coffee cup．It went right over ________ keyboard．

－You shouldn't put drinks near ________ computer．

A．the;/

B．the; a

C．a;/

D．a; a

The father as well as his three children ________ skating on the frozen river every Sunday afternoon in winter．

A．is going

B．go

C．goes

D．are going

If Harry did not attend the conference last night, he ________ too much work to do．

A．had to have had

B．had had

C．must have had

D．must have

－Mary looks hot and dry．

－So ________ you if you had a high fever．

A．do

B．are

C．will

D．would

We were given ________ great surprise when he said he would leave ________ office soon．

A．/; the

B．/;/

C．a;/

D．the; the

In China, ________ bicycle is ________ popular means of transportation．

A．the; the

B．the; a

C．a;/

D．a; the

________ Women's Day is just round the corner．I want to buy a present for my mother, ________ one that is useful but not expensive．

A．The;/

B．/;/

C．A; a

D．/; the