几道英语选择题.帮一下忙哈.

几道英语选择题.帮一下忙哈.
1.Why do you blame him for the failure _____ he really needs is encouragement?
A. when that B. now that C. when what D. when which
2.Bill plays football _____, if not better than, Robert.
A. as well as B. as well C. so well D. so well as
3.The business _____ when we failed to agree on a price.
A. fell behind B. fell upon C. fell off D. fell apart
4.The two bags are of great _____.
A. differences B. difference C. different D. differently
5.The robot worked twice as _____ as a skilled worker.
A. fast B. quicklyC. faster D. soon