When I try to understand（ ）that prevents so many Americans from being as happy as one might expect,it seems to me that there are two causes.

单选题

What should theteacher try to avoid when selecting listening materials?

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单选题

What should the teacher try to avoid when selecting listening activities?

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单选题

We always try to go to a different___ when we go On holiday.

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单选题

When people are surrounded by ______ communication and encouragement, they can find the courage to try, fail, redo, and try again.

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单选题

Try to guess its meaning when you meet a new word. Don’t _______ the dictionary all the time.

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