. Enough attention should be paid to _____ your pronunciation and intonation.
| A．improve | B．improving | C．improved | D．be improve |
——Need I clean the room now？
——Yes， you _____ ， but you ______ ask someone to help you.
| A．need， need | B．must， can | C．need， can | D．must， need |
——Don't forget to come to my birthday party tomorrow.——______.
| A．I don't | B．I won't | C．I can't | D．I will |
What do you think ______ an apple ______ to the ground？
| A．cause， to fall | B．to cause， falling |
| C．causing， falling | D．causes， to fall |
Why do you think ______ cut down the big tree？
| A．we can't | B．can't we | C．that we can't | D．that can't we |
—— ______ if I smoked？ ——I'm sorry， but it's not allowed.
| A．Do you mind | B．Did you mind |
| C．Would you like | D．Would you mind |