词语辨析.
A. add up／add to／add up to
1. Five ____ seven makes twelve.
2. The pupils are too young to ____ these figures.
3. The amount of money he makes a month ____ more than 59 000 dollars.
B. calm／still／silent
4. After the storm the sea became ____ again.
5. Keep ____. I am taking a photo of you.
6. Don't keep ____ on bad behavior.
C. too much／much too
7. Never drink ____, for it is bad for your health.
8. The question is ____ difficult for me. Would you please help me out?