21.     Mr. Green stood up in defense of the 16-year-old boy, saying that he was not the one ____.

A. blamed                    B. blaming                   C. to blame            D. to be blamed

22.     The doctor telephoned to say that he couldn’t ____ the meeting because he had to ____ a patient.

A. come to, attend to     B. attend, attend            C. join, treat          D. attend on, look after

23.     No one has ____ anything better than the plan now under consideration.

A. put toward               B. come up                   C. put forward              D. come up to