【小题1】Dr Ma felt tired after two ________________(手术).
【小题2】The terrible car accident caused her _________________(失明).
【小题3】You can check the __________________ (采访者) names on the Internet.
【小题4】Having a 10-minute break between two classes is very ____________.（必要的）
【小题5】The customs in Qingdao are __________________ (相似) to those in Yantai.

We should do our best to prevent the river from __________.

A．pollute

B．polluting

C．be polluted

D．being polluted