根据句意及所给的首字母或中文提示完成单词，使句意完整。每空只能填一词。

小题1:One of my             (牙齿) hurts badly. I have to see a dentist.

小题2:Could you             (借) me your bike? Mine is broken.

小题3:Mr. Smith lives on the             (第十二) floor, and the lift can take you there.

小题4:The government has done everything to             (保护）the students from any danger.

小题5:There are many other ways to learn English             (除了) reading aloud.

小题6:Yesterday morning I r            a letter from my parents.

小题7:We should keep q            in the reading room.

小题8:She got up very late. So she hurried to school w            breakfast.

小题9:Stop smoking. It’s bad for your h           .

小题10:Our city is f            for its clear air，beautiful mountains and blue sea. It attracts many tourists every year.

安装永久性心脏起搏器的指证是

A．频发室早
B．心房纤颤
C．心室纤颤
D．病态窦房结综合征
E．Ⅰ度房室传导阻止