21．—Would you please give me a hand and take the bookcase upstairs?
— ．
A．My pleasure B．With pleasure
C．Of course I do D．Yes．That’s all fight
22. In order to find ______better job, he decided to study _________ second foreign language.
A. the; a B. a; a C. the; the D. a; the
23. The doctor told me to take the medicine .
A. every fourth hours B. each fourth hour
C. each four hours D. every four hours
