21. impression you make at the beginning of interview is very important .
A. An;an B.The ;an C.the;/ D./;an
22.I know that the concert is on Friday night but I don’t know the time that it starts .
A.special B. particular C.specific D.certain
23. the time we arrived the new place , the exam was already way.
A./;at;in B.By;in;on C. By; at ; under D./ ; in ; on