known to us,_______ increasing numberof students are buried in their studies

The happiest people are not those ________ have the best of everything, but ________ make the best out of everything.

Do you know the tower _____ in the heart of thecity — You mean the one _____ from the MingDynasty

Mr. Li makes me ____, because it is bad for my health.

I have some _________ in working out the problem.