----May we leave the classroom now?
----No, you . You to leave until the bell rings.
| A．mustn’t; are allowed | B．can’t; aren’t allowed |
| C．don’t have to; are allowed | D．needn’t; aren’t allowed |
It’s a beautiful，sunny day! There ________ many people here on vacation.
| A．be | B．am | C．is | D．are |
Don’t be afraid of asking for information ______it is needed.
| A．when | B．after | C．although | D．unless |
There great changes in our city in the past 10 years.
| A．were | B．had | C．have been | D．have had |
Hurry up!The play for ten minutes.
| A．has begun | B．began | C．has been on | D．has been |
Look! The tree is growing well. When______?
| A．was it planted | B．did it plant |
| C．will it be planted | D．is it planted[ |