21.Many middle school teachers are too heavily with teaching to engage in research work.
A. burdened B. related C. associated D. provided
22.The rich only themselves in making money and had no eye for the needs and welfare of
their workers
A. devoted B. concerned C. enjoyed D. occupied
23.— Sunny day, isn’t it?
— Let’s hope the sunny weather for Saturday’s tennis match.
A. carries on B. moves on C. keeps up D. goes up