Guess what! I have got A for my term paper. — Great! You ______ read widely and put a lot of work into it.

The solider was _______ in the arm in the war.

The world economy has improved ____ since the end of last year, but major problems are not fully solved [ ]

It is generally believed thatmutual understanding ______ a happy marriage and life.

下列各句中，表达得体的一句是（）