（ ）21. -- _____ Blacks are going to the park. Why don’t we go for _____ walk, too?
-- Good idea.
A. A; an B. An ; / C. The; D. /; a
( )22. Mr. Wu _______ an English-Chinese dictionary for three years。
A. have bought B. has bought C. bought D. has had
( )23. Li Lei can often make us ________. He is good at making faces.
A. happy B. happily C. to laugh D. laughing
