—Smoking is bad for your lungs and it can even cause cancer.
—Oh! I think I must ______ smoking.
A. get up B. give up C. grow up
---I am sorry to have kept you ___________.
---It doesn't matter. I've just come.
| A．wait | B．waited | C．waiting | D．to wait |
The number of students in our school_________ more than 2000.
| A．is | B．are | C．has been | D．Was |
At the science museum，the boys and girls get to know__________.
| A．what is the spaceship like |
| B．what the spaceship looks like |
| C．how the spaceship looks 1ike |
| D．how does the spaceship 1ook like |
The more you smile, the ___________ you will feel.
| A．happy | B．happier | C．happily | D．more happily |
We should study the new traffic rules and 1earn how___________ ourselves．
| A．protect | B．to protect | C．protecting | D．protected |