兼有两种形式的副词
1)close与closely
close意思是"近"; closely 意思是"仔细地"
He is sitting close to me.
Watch him closely.
2)late 与lately
late意思是"晚"; lately 意思是"最近"
You have come too late.
What have you been doing lately?
3)deep与deeply
deep意思是"深"，表示空间深度;deeply时常表示感情上的`深度，"深深地"
He pushed the stick deep into the mud.
Even father was deeply moved by the film.
4)high与highly
high表示空间高度;highly表示程度，相当于much
The plane was flying high.
I think highly of your opinion.
5)wide与widely
wide表示空间宽度;widely意思是"广泛地"，"在许多地方"
He opened the door wide.
English is widely used in the world.
6)free与freely
free的意思是"免费";freely 的意思是"无限制地"
You can eat free in my restaurant whenever you like.
You may speak freely; say what you like.
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
It is worth while sb to do sth.
典型例题
It is not ____ to discuss the question again and again.
h hy h-while h 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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