The man we followed suddenly stopped and looked as if ______ whether he was going in the right direction.

Tom pretended______it but in fact，he knew it very well.

Without facts，we can’t form a correct opinion，for we need to have actual knowledge______our thinking.

Since you have found it hard to learn Spanish，why not try ______foreign language？

We did not expect the plan we had made very carefully for them ______ so coldly.

—Have you found out the telephone number I need？—Yes，but ______，I have sit here for nearly a half hour.

I’d rather read than watch television;the programs seem ______ all the time.

Mr Johnson preferred ______ heavier work to do.

The patient was warned ______oily food after the operation.

Russia will soon return 174 sq km of territory on the northeast border to China, ______ more than 40 years of negotiations．

The children are seldom encouraged ________up late at night preparing their lessons,if ________.

Though great efforts have been ________on her study,Annie can’t still make any improvements,which makes her parents greatly________.

Mr Hiward,a man ________himself Dan came to see you this morning,and left you a message here.

A sudden blizzard occurred in Beijing last night,______great inconvenience in transport.

The idea suddenly______me is that we should go outing.

Though I am improving in my study,I still have a long way to go ________ some of my classmates.

I’m sure cars ________ by solar energy will be popular in the near future. 

________ English will help to communicate _____ people from different countries in the world.

In January, 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind. 

When people move to another country, they often try ________ the customs of their native land.