1 . The teacher told us that everyone has an important role ________in protecting the earth from________.

A．to play; to pollute	B．to be played; to be polluted
C．to play; being polluted	D．to be played; being polluted

2 . She was afraid __________ the dog in case it became dangerous.

A．of exciting	B．to excite
C．that she excited	D．to be exciting

3 . Tom was the first man _______ after the accident.

A．questioned	B．to question
C．to be questioned	D．being questioned