词汇（注意用正确的形式填空）。

1. The old man _____ (锻炼) every morning.

2. I often _____ (购物) on weekends.

3. We must _____ (保持 ) our classroom clean.

4. There are some _____ (不同) between the two pictures.

5. He _____ (几乎不) goes to restaurant for dinner.

6. Katrina doesn't often ______ (喝) coffee, she likes green tea.

7. My eating ______ (习惯) are not very good.

8. Everyone must ______ (设法) to work hard.

按现行产品标准规定，铝合金建筑型材按横截面尺寸的允许偏差，分为（）。

A.普通级

B.高精级

C.超高精级

D.特精级