Lin Hai and Dave __ his good friends.

.Since we have failed many times, why nottake a new _________to solving the problem

ports ______ a big role in its economic growth, China has been affected bythe current financial storm

下列词语的解释有误的一项是（ ）

I don’t doubt_______ he took the firstplace in his class; but I do doubt_______ he will succeed in the end.