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

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).