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