I will never understand how it ______ that you failed in the examination for you are such a good student. 

Armed with the information you have gathered, you can ____ preparing your business plan.

Well, since you ________ it like that, I can’t really refuse.

If you can't __ your shyness,  you'll never pass the English oral test.

Don’t spoil (惯坏) the child. Can’t you make your little son ______ himself?