It is said that the gravity on Mars is only about __________ of the gravity on earth．
| A．three-eighths | B．third-eighth | C．three-eighth | D．third-eighths |
— Why did you persuade me _____ that dress?
— Because I think it’s suitable for you.
| A．buy | B．buying | C．to buy | D．bought |
Keep on going and never ___, and then you will succeed.
| A．look up | B．bump into | C．throw away | D．give up |
I remember seeing the man in the street last week.
| A．sometime | B．some times | C．sometimes | D．sometimes |
— It’s ____ cold. Would you please close all the windows?
— OK. I’ll do it now.
| A．a kind of | B．a few | C．a lot | D．a bit |
Walking up and down the stairs is a good kind of exercise to stay _____.
| A．health | B．healthy | C．healthily | D．healthful |