all of the work is worth____

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.

all of the work is worth doing
所有工作都值得做
be worth doing 值得做，选B
希望有帮助(*^__^*) 嘻嘻……

b.doing
be worth doing something