— Let me help you.
— Thanks.
— That's OK.
| A．That's right. | B．You're welcome. |
| C．Good. | D．It's right. |
【2013四川广安】—____I swim here?
—No, you _____. Look at the sign “No swimming”.
A. Must：can’t
B. Can; don’t
C. Can; mustn’t
【2013四川南充】— Excuse me, whose book is this?
— It ________ be John’s. It hashisname on it.
A. mustB. needC. can’t
【2013四川遂宁】―Must I return the book this week?
― No, you . You can it for 20 days.
A. mustn’t, keep
B. needn’t, borrow
C. needn’t, keep
【2013浙江舟山、嘉兴】Drivers ________ wear seat belts while theircars are running on the road.
| A．need | B．can | C．must | D．may |
【2013江苏徐州】—Can I borrow your ruler，please?
—Yes，you . But you must return it to me before lunchtime.
| A．have | B．can | C．must | D．used to |