1、They were surprised at ______ factitious.

　　A. the city　　B. the city's

　　C. the city of　　D. for the city

　　2、Is there anybody who can undertake the job?

　　 　None ______ I know of.

　　A. whom　　B. whose　　C. which　　D. that

　　3、The twin sisters are so alike that no one can tell ______.

　　A. who is who　　B. who is whom

　　C. what is whom　　D. whom is who

　　4、I cannot thank you ______ much for your kindness. I owe all my success to you.

　　A. so　　B. very　　C. too　　D. as

　　5、We saw them last week, but we ______.

　　A. haven't seen them since　　B. never saw them since

　　C. since haven's seen them　　D. have seen since them