12.attach great importance to sth.
　　
　　13.… is a hot issue
　　
　　14. satisfy/meet one’s needs and desires
　　
　　15.sth. benefit sb.= sth. do good to sb.
　　
　　sb. benefit from sth.　sb. receive benefit from/by sth.
　　
　　sth/it. is beneficial to sth./sb.
　　
　　16.try every means to do sth./strive to do sth.
　　
　　17.sb. do sth., while sb. others do sth. else
　　
　　18. it is supposed to do sth.

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