When about one of the biggest problems today, many experts say that an energy crisis is approaching and is thus threatening mankind's survival.
Mr. Li doesn’t think that all bad language should be allowed. In his opinion, there are ______ that should be kept up.
______ likes money, but money is not ______.
She rose from being a _______ to become a superstar.
It’s sometimes difficult to tell one twin from _____.
—Has the little girl passed ______ P.E. test? —She has tried twice, and the teacher will allow her to have _____ third try.