put off keep on insist on count on / upon set about be successful in good at take up give up burst out prevent ? from? 3）作表语
Her job is washing，cleaning and taking care of the children.
5.2 worth 的用法
worth，worthy，worth-while都为adj. 意为\值得\。
1. worth： be worth + n. 当名词为金钱时，表示\?? 值得??\
be worth doing sth. \??某事值得被做\
The question is not worth discussing again and again. 2. worthy：be worthy of +n. 当名词为抽象名词时表示\??值得??\
be worthy to be done \某事值得被做\
The question is not worthy to be discussed againand again.
3. worth-while： be worth-while to do sth \值得做某事\ worth while： It is worth while doing sth
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It is worth while sb to do sth. 典型例题
It is not ____ to discuss the question again and again. A.worth B.worthy C.worth-while D.worth while
答案C. 由worth的用法可知，此句只适合词组be worth-while to do sth.。因此选C。
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