You should _____ your opinion _____ the facts, understand?

A. base; on.　　　　 B. based; on　　　 C. to base; to.　 D. base; with.

Cao Cao’s tomb is reported ______ in China, which attracts nationwide attention.

　 A.being found　　　　　　　　　　　 B.to be found

C.having been found　　　　　　　　 D.to have been found

Some insects________the colour of their surroundings to protect themselves.

A. take in　　 B. take off　　　 C. take on　 D. take out

The tourists often complained of being _____ by the local peddlers when they buy some souvenirs.

　 A. ripped off　　 B. ripped out　 C. ripped up　 D. ripped way

Our troops are going to make an _________ on the enemy.

A.attack　　 B. attempt　 C. attention　　 D. attraction

China is situated in one of the most active earthquake regions in the world and there have been many terrible earthquakes.

_______________________________________________

I hadn’t seen him for 10 years but I　　 him at first sight.

A. realized　　 B. spotted

C. watched　　 D. observed

They are _____ children that they can’t dress themselves.

A. so little 　 B. such little　　 C. so small 　 D. too small

We should try our best to _______ the cultural relics.

A.reserve　　　　　 B. preserve　　　 C. defend　　　　 D. keep

Experts have been warning　 of the health risks caused by passive smoking.

A.at a time　　　　 B.at one time　 　　　　 C.for some time　　 D.for the time