1. discover / find / invent
[解释]
discover表示“偶然”或“经过努力”发现客观存在的事物、真理或错误。
find意为“发现,找到”,指对某种事物的寻求,也指对丢失的事物的找到。
invent 指设计或制造原来没有的东西。
[练习]用discover,find,invent的适当形式填空。
1). Columbus _______ America in 1492. 
2). You will _______ it a difficult book.
3). When did you _______ that she’ s married?
4). I’ ve _______ the book I was hunting for.
5). Alexander Graham Bell _______ the telephone in 1876.
Keys: 1). discovered   2). find   3). found   4). discover  5). invented
2. hope / wish / expect
[解释]
hope 后面只能接不定式和that从句,表示一种有信心的可实现的希望。
注意:① hope后不能接动名词作宾语,也不能用hope sb. to do sth. 结构。
    ② 省略答语中,not不可放在hope前,如不能说I don’ t hope so.只能说I hope not.  
wish 通常表示有某种未实现或无法实现的欲望或希望,wish后跟从句时常用虚拟语气。
expect 表示“预期,盼望,期待,料想”,后面可跟名词、代词、不定式,that从句等。  
[练习]用hope,wish,expect的适当形式填空。
1). We _______ that our children will carry on our family traditions. 
2). I _______ you a very happy future.
3). What do you _______ me to do?
4). Most of the parents _______ much of their children.
5). I am _______ a letter from her.
6). I ________ I were really wealthy.
Keys: 1). hope   2). wish   3). wish / expect   4). expect  5). expecting   6). wish
3. bear / endure / stand / tolerate 
[解释]
bear强调忍受者对痛苦、忧虑、烦恼以及责任的承受力,常用于否定句中。
endure意为“经受长期的艰难、困苦或折磨而不屈服”,强调持久力和意志坚强,常用于否定句中。
stand强调不屈不挠或经受得起,常用于否定句中。
tolerate意为“忍受某人或某种行为而不反抗”,语气最弱,可用于肯定句和否定句。
[练习]用bear,endure,stand,tolerate的适当形式填空。
1). Our tent won’ t _______ another storm like the last one. 
2). I can’ t _______ to wait any longer.
3). She’ s already had to _______ three painful operations on her leg.
4). I will not _______ that sort of behaviour in my class.
Keys: 1). stand   2). bear   3). endure   4). tolerate
4. set off / set out / set about
[解释]
set off “出发”,侧重于去某个地方。
set out “出发,开始”,侧重于开始做某事,还有规划,展现的意思,后加不定式。
set about “开始,着手”,与set out意思相近,后加v-ing形式。
[练习]用set off,set out,set about的适当形式填空。
1). They succeeded in what they had _______ to do. 
2). Having made up his mind, he _______ carrying out the plan.
3). If you want to catch that train we’ d better _______ for the station immediately.
Keys: 1). set out   2). set about   3). set off  
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