What do we mean by a perfect English pronunciation? In one sense，there are as many different kinds of English__11__there are speakers of it.No two speakers speak in exactly the same__12__. We hear different forms of English，and the pronunciation of English__13__a great deal in different geographical areas.How do we decide what sort of English to use as a model? This is not a question that can be__14__in the same way for all foreign learners of English. ___15__you live in a part of the world like India or West Africa，where there is a long___16__0f speaking English for general communication purposes，you may___17__a good variety of the pronunciation of this area.It would be a(n) ___18___in these circumstances to use BBC English as a model.However，if you live in a country___19__there is no tradition of using English，you should choose to learn some form. of native English___20__.It does not matter very much which form. you choose.The most effective way is to take as your model the sort of English you can hear most often. 

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他这人缺点很多，但责任心很强。

Withholding feelings，that is，keeping them inside and not giving any verbal or nonverbal clues to their exstence，iS generally an inappropriate means of dealing with feelings.Psychologists believe that when people withhold feelings，they Can develop physical problems such as cancers，high blood pressure，heart disease and psychological problems.Moreover, people who withhold feelings are often regarded as cold，unsociable，and not much fun to be around.However, there are occasions where withholding is appropriate.When a situation is unimportant，you may well choose to withhold your feelings.For instance，a stranger’s inconsiderate behavior. at a party may annoy you，but as you can move to another part of the room，withholding your feelings might be a way out.

事实证明，父母的行为对其子女有很深的影响。

他们谈论的这位足球运动员是美国人。

这项任务比预期的要难得多。

我要是早点动身就赶上火车了。

Recent developments in computer aided design have _____(able) us to produce more cost—effective magazines.

The Internet has opened up a marketplace where sellers and buyers are virtually _____ (know) to each other.

Sixty percent of voters supported the proposal and said they would _____ (willing) pay higher taxes for better health care.

Lots of people in urban areas are now concerned about the quality of the air they_____ (breath).