“天下共苦，战斗不休，以有侯王。赖宗庙，天下初定，又复立国，是树兵也，求其宁息，岂不难哉！”秦始皇为“求其宁息”的措施是  [ ]

A、焚书坑儒 　

B、修筑长城 　

C、推行郡县制

D、攻打匈奴

根据句意和首字母或汉语提示完成单词。

1. — How often does Mary exercise? 

    — She exercises t________ a week.

2. — Could I b_______ your bike?

    — Yes. Here's the key.(钥匙)

3. It often rains in s________ China in summer.

4. Here are two _________(薄片) of bread.

5. Her writing __________(习惯) are very good.

6. I was really busy. I spent the w________ morning doing my homework.

7.We must read ____________(说明) before taking medicine.

8. He won first prize in the singing c_________.

9. Her favorite subjects are c____________ and physics.

10. My cousin b_________ a teacher in 2008.