1 . My father, ________ has been working as a teacher for 35 years, is retiring next month.

A．which

B．who

C．that

D．as

2 . A year is divided into four seasons, as we all know, _______ the first is spring.

A．which

B．of them

C．when

D．of which

3 . John got beaten by his opponent in the game, ________ had been expected.

A．as

B．that

C．what

D．who

4 . Recently they have been developing a new kind of drug, ________ effects we are greatly concerned.

A．to whose

B．about whose

C．to which

D．about which

5 . I walk through the doors into the waiting area,         there's a familiar atmosphere of boredom and tension.

A．which

B．that

C．whose

D．where

6 . I showed an old friend of mine around the city, ________ surprise, the changes had been so great.

A．whose

B．which

C．to which

D．to whose

7 . Having a mix of male and female nurses also helps create a fun atmosphere, _________ helps patients recover faster.

A．this

B．that

C．which

D．where

8 . The letter is from her fiance, ________ is fighting for their homeland at the front now.

A．who

B．which

C．he

D．whose

9 . It was difficult to keep a positive attitude when I had a list filled with things to do, _____ none sounded like fun.

A．for which

B．to which

C．of which

D．from which

10 . We have collected more than 500 children books, ________ are preserved in good condition, and they will surely be ________.

A．most of which; of great help	B．most of whom; of great help
C．most of them; helpful	D．most of which; of helpful