—Are there any balls under the chair? —________.
| A．Yes, there is | B．Yes, they are | C．Yes, there are | D．No, there are |
Mom, don’t worry ______me. I can take care of myself.
A. about B. with C. for
Do you prefer _______?
A. skate B. skates C. skating
—Must I finish my homework at once?
— No, you ______.
A. needn’t B. mustn’t C. won’t
You ______ wash your hands before meals. It is good for your health.
A. may B. can C. must
It’s hot here. Please keep the windows _
A. closing B. open C. closed