Its just waste of time.

    He is ashamed of his past.（be ashamed of 羞耻，惭愧）

    The village is short of water.（be short of 缺少）

    I do all these of my own will.（of ones own 出于某人的意愿）

    20. on（在……上）

    You hit the nail on the head. 你这话击中了要害。

    Put the book on the shelf ， please.

    My mother was born on April 14， 1947.

    （哪一年用in，具体到某一天用on）

    He left Beijing for home on the morning of July 2.

    （in the morning，具体到某一天的上午、下午、晚上用on）

    On the eve of their departure ， they gave a farewell banquet.

    （on the eve of 在……前夕）

    We usually get up late on Sunday morning.

    On his return he told us about the meeting.

    They will go on a visit to Asia.（go on a visit=visit ）

    He is here on business. （be on business做生意）

    She is away on a trip.（on a trip 旅行）

    The workers at the airport is on strike.（be on strike罢工）

    When we came back ， we found our house on fire.

    （on fire 着火）

    The professor is making a speech on the current situation.（关于）

    This house is on sale.（on sale 出售）

    Whos on duty today？

    The girl insists on leaving home and depends on herself for a living.

    （insist on 坚持 depend on依靠，依赖）

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    The coat is out of date.（be out of date过时）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

    Weve 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.

    Ive 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）

    Youre 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）

    Shes ill all through September.

    24. to

    All roads lead to Rome.

    Did you go to the exhibition last week？

    Well change the date to July 10.（to到什么时间）

    Lets drink to your health.（drink to为什么干杯）

    Dont 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.

    Youre awfully nice to me.

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

    To our surprise ， she gave up the opportunity. （to ones

    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）

    Were satisfied with our work. （be satisfied with 对……满意）

    She is discussing the idea with her tutor.

    Were familiar with each other.（be famililar with 熟悉 similiar to
相似）

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

    Hes 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.

    The young man with glasses over there is my brother.

    Whats the matter with you ？

    I found the place with great difficulty.（with great difficulty 费
很大劲）

    Its hot outside. He was working there with only a T-shirt on.