---Must we leave the classroom now?
---No, you _____. You _____ leave after the bell rings.
| A．mustn't; are allowed to | B．don't have to; might |
| C．needn't; can | D．can't; are supposed to |
— How could they keep us waiting for so long?
— They got on the bus half an hour ago and they ________ be here in ten minutes, I think.
| A．might | B．would | C．should | D．must |
_______ fashion differs from country to country results from cultural diversities in the world. 
| A．What | B．That | C．This | D．Which |
— Would you like to join us in a field trip this weekend?
— I’d like to. But I can’t ______ the time because I have an important exam to take on Monday.
| A．kill | B．take | C．afford | D．spend |
Just a few minutes every day, _______ you could have shining floors and furniture with this new cleaner.
| A．but | B．and | C．or | D．so |
— If I hadn’t been caught in the heavy rain, I could have been back by 7 o’clock.
— What a pity! Stella _______ here to see you.
| A．is | B．has been | C．would be | D．was |