______ time goes by, China is getting stronger and stronger.
| A．Until | B．While | C．As | D．When |
He’s gone to the library ,_______ he ?
| A．isn’t | B．doesn’t | C．hasn’t | D．wasn’t |
---Did you get there by _____bike?
--- No, I took _____taxi.
| A．a, a | B．/,a | C．the , the | D．a , the |
—Why don’t you divide the students into six groups?
—_________.
| A．No, I don’t | B．That’s right |
| C．Sounds a good idea | D．Be more careful |
Mr. Green didn’t post the letter _________. He asked his son to do it for him.
| A．itself | B．myself | C．herself | D．himself |
—Is Tom still in New York or already back at home?
—I’m not sure _________. I’ll call to make sure.
| A．if he has been back | B．that he has come back |
| C．why he has come back | D．how he will be back |