cases of blindness; train the local doctors and nurses;used to;a flying eye hospital; carry on with our work; be grateful to sb;

　　perform operations; affect sixty per cent of students; have some pocket money left; be proud to dosth; treat and cure eye

　　problems; have the money for the medicine; get education; raise money for charities; donate money to

　　練習(xí)十八

　　international charities; help poor people; take action to do sth.; cate about others; be in hosipital; voluntary doctors; pocket money; organize events to raise money; set up UNICEF; spend money on

　　advertisement; operation; development; education; proud; sickness; flying; teaching; organization; tratment;

　　BBADCCCBCCBCBAD

　　練習(xí)十九

　　BCADE;

　　charity; eye; cured; prevented; operated; operations; see; local; skills; knowledge; support

　　It was started on 11 September,1961

　　It works to save the earth and its environment

　　Volunteers and donations.

　　To stop air pollution,protect the earth forests and save all plants and animals.

　　In China,it works to save the panda from dying out. In South America, it works to save the Amazon Rainforest

　　afford;patients;skills;do;cases

　　練習(xí)二十

　　連線舍去performing an operation; pocket money; operated on; medical treatment; used to; were grateful to; Is used to; a flying eye hospital; had a big lunch; cases of blindness;

　　too weak to; used to get; isn't used to; Did use to watch; used to be; is used; isn't cheap enough

　　BCDAC BCABA CCBCA

　　練習(xí)二十一

　　agreement; gladness; collection; illness; prevention; advertisement; development; decision; kindness; gentleness; sadness; sickness; education; organization; improvement; usefulness; movement; happiness;

　　has cured illness; poor areas for medical treatment; is performing operation on ; proud have helped; carry on with;

　　grateful to for donations; used to drink; Used to; have lived am used to; used to live; are used to living;

　　operating; attacks; patient; improving; blind;care; indeed; education; perfect; medical;

　　B be; C going; C blindness B not; A are; B drink

　　練習(xí)二十二

　　CBEADF

　　careless; the longest; itself; elderly; tree planting; unable; further; busier;

　　BBCBCCCBAD

　　練習(xí)二十三

　　join; tough; trail; aim; experience; happen; develop fund-raising

　　spirit; improve; excellent; violin; February; experience; especially; recorded;

　　singing; writing; is held ; join; to raise; has been built; to slove; was singing; called; playing;

　　去掉it; 去掉been; cross; been over; because of; helping; drinks; drinking; bringing; but去掉

　　練習(xí)二十四

　　don't; will; It difficult to; more any other; How can help; will be recorded; with; For on;without; on ; in; to; By; to

　　It's wrong to look down on poor people.

　　It is a good season for us to enjoy the beautiful view.

　　It's necessary to be careful when you cross the road.

　　Don't miss the chance you should help each other;

　　It's important for children to have support from parents

　　fund-raising;raise;November ;group;join;tough;eight;twenty;together;recorded;spirit;support;best;experience