21. You’d better sit in ______ front of the bus so you can have ______ better view on the way.
A. the; 不填 B.不填; the C. the; a D.不填; a
22. He is kept in the dark and is not _______ that the company is losing money.
A. known B. known about C. aware D. aware of
23. Those who are not active or______ diet is high in fat will put on weight quickly.
A. what B. that C. which D. whose
24. 一Professor Li, ______the student start at once or wait a while?
一At once.
A. will B. shall C. can D. may
