21. out of(出于)

　　Looking out of the window, I saw a girl turn round the corner.

　　They came out of the room to welcome us.

　　My brother has been out of the hospital for a week.

　　(be out of the hospital 出院 be in hospital 住院)

　　He did it out of gratitude for us.

　　We helped the poor boy out of sympathy.

　　Please get out of the way. 别挡道。

　　All of us were out of breath when we got to the top of the mountain.

　　(be out of breath 气喘吁吁)

　　The coat is out of date. (be out of date 过时)

　　My mother is out of work now. (be out of work 失业)

　　22. since(自从)

　　They have been close friends since childhood.(从儿童时期他们就是好朋友)

　　We've always been on guard since then.(be on guard 警惕)

　　I got to know him last year, and have been writing to each

　　other since then.

　　23. through(通过、穿过)

　　There is a path through the garden.

　　I've gone through the book.(go through 看过 浏览过)

　　She must have been through a lot.(be through 受罪)

　　We quickly saw through his trick.(see through 看穿)

　　How soon will you be through? (be through 打电话)

　　You're through now.你的电话接通了。

　　He began to look through the album.(look through 翻阅)

　　The couple went through many hardships.(go through 经历)

　　She's ill all through September.

　　24. to

　　All roads lead to Rome.

　　Did you go to the exhibition last week?

　　We'll change the date to July 10.(to 到什么时间)

　　Let's drink to your health.(drink to 为什么干杯)

　　Don't leave things to the last moment.(to the last moment 到最后一刻)

　　I must apologize to you.

　　Happy Christmas! The same to you.

　　You're awfully nice to me.

　　Hainan lies to the south of Guangdong.(lie on, lie in )

　　To our surprise, she gave up the opportunity.(to one's

　　suuprise 使某人感到惊奇 give up 放弃)

　　The final score is 3:5 in our favor.

　　To our surprise, everything in the room is in good order.(be in good order 秩序井然)

　　25. under(在……的下面)

　　Some girls are singing under the trees.

　　The road is under repair.(be under repair 正在修理)

　　From here, we can see the bridge under construction.

　　Scientists believe that they will get weather under control

　　some day.(under control 在控制之中)

　　The proposal is now under discussion.(proposal 提案)

　　The unpopular mayor is under constant attack in the newspapers.

　　26. with(和……)

　　Who was that with you? 你刚才和谁在一起?

　　Our teacher is strict with us.(be strict with sb. 对某人严格要求)

　　My father is always patient with me.(be patient with 对某人有耐心)

　　We're satisfied with our work.(be satisfied with 对……满意)

　　She is discussing the idea with her tutor.

　　We're familiar with each other.(be famililar with 熟悉 similiar to 相似)

　　Her eyes were filled with tears.(be filled with 充满)

　　He's in bed with flu.

　　The ground was covered with snow.

　　The street is crowded with people.(be crowed with 拥挤)

　　He wanted to kill two birds with one stone.( 一举两得)

　　The girl greeted me with a smile.