I.单项选择（15分）
1. The boss often makes the workers _______ nine hours a day.
A. work B. to work C. working D. worked
2. I volunteer ______ others.
A. help B. to help C. helping D. helped
3. ---Would you like me to help you with the housework?
---______, but I can manage it myself.
A. That’s very kind of you B. No
C. Take it easy D. The same to you
