______ time went by, Cindy and the other kids became good friends.
| A．When | B．While | C．With | D．As |
Lisa won ______ MP4 in the singing competition last week.
| A．a | B．an | C．the | D．/ |
Some young people are now to buy private (私人的) cars.
| A．quite rich | B．very rich |
| C．rich enough | D．enough rich |
—Hi, Tom, why do you look so tired?
—Because I ______ last night to finish my homework.
| A．stayed up | B．made up |
| C．wake up | D．looked up |
The underlined letter “ a” in the word “______” has different pronunciation （发音）from the others.
| A．activity | B．talented |
| C．fantastic | D．trader |
- ______ exercising, and you'll be healthier.
| A．Keep | B．To keep |
| C．Keeping | D．Kept |