This is the third book that he has written in the past five years, the first of       I really enjoyed.

A．which B．that    C．those        D．them

This is the third book that he has written in the past five years , the first of ____ I really enjoyed.

This is the third book that he has written in the past five years, the first of ________ I really enjoyed．

1. A.
   which
2. B.
   that
3. C.
   those
4. D.
   then

4. He finally _______ to find the reference book that he has been looking for.

A. tried 　　　 B. attempted 　 C. ran 　　　　　　 D. managed