While working in the country, the students ______ a lot of knowledge about plant.

A. looked up B. picked up C. put up D. called up

The difficulty which we had ______ with the local people has been removed.

A. communication B. communicated

C. communicating D. to communicate

Before the sales start, I make a list of ______ my kids will need for the coming season.

A. why B. what C. how D. Which

Some insects ______ the color of their surroundings to protect themselves.

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

If you ______ any problems when you arrive at the airport, give me a ring.

A. come up with B. set about

C. run into D. put aside

The instructions on the bottle are really _______. I can't understand them at all.

A. encouraged B. various

C. confusing D. standard

All my classmates were _______ my idea that we should go on an outing next week.

A. in honor of B. in memory of

C. in favor of D. in case of

He was about to cross the street ______ he heard his name ______.

A. when; called B. if; calling

C. and; calling D. till; called

--- Let's go to the seaside and enjoy fresh air, OK?

--- _______. I'll wait for you at the gate.

A. I don't get it B. You made a fuss of me

C. I get used to it D. That's a good point

閱讀下面材料，在空白處填入適當(dāng)?shù)膬?nèi)容（不多于3個單詞）或括號內(nèi)單詞的正確形式。

Not all memories are sweet. Some people spend all their lives trying to forget bad experiences.

Now American researchers think they are close to developing a pill, ___1.___ will help people forget bad memories. The pill is designed ___2._ (take) immediately after a frightening experience. They hope it might reduce, or ___3.__ (possible) erase (抹去) the effect of painful memories.

In November, experts tested a drug on people in the U.S. and France. The drug stops the body from __4.___ (release) chemicals that fix memories in the brain. So far, the research __5.___ (suggest) that only the emotional effects of memories may be reduced, not that memories are wiped out. They are not sure to the degree people’s memories are affected.

The research has caused a great deal of ___6.__ (argue). Some think it is ___7.__ bad idea, while others support it. Supporters say it could lead to pills which prevent or treat soldiers’ troubling memories after war. They say that there are many people who suffer from terrible memories. ___8.___, those who are ___9.___ the research say that maybe the pills can change people’s memories and changing memories is very __10.___ (danger) because memories give us our identity.