4.    I ________ her since I________ a student
A. have known/ was
B. knew/ was 
C. know/ am
D. have known/ am
  
5 . He________ as a new reporter since he________ from Boston university. 
A. worked / graduated
B. worked/ has graduated
C. has worked/ graduated
D. works/ graduates

    6.    We ________ that television program. A. never watch 
B. has never watched
C. not never watch
D. have never watched

7 . I ________ there once a long time ago and ________ back since. 
A. have gone/was
B. went/have not been
C. go/am not
D. was going/had not been

8 . There is one mistake in each of the following sentences. I am trying to learn English for years. 
A. am trying
B. learn
C.for
D.years
 
9.There is one mistake in each of the following sentences. Fred's brother just graduates from university. *
A. Fred's brother
B.graduates
C.from
D. university