22. The two boys fought and fought until one ______.
| A．gave up | B．gave in | C．gave | D．gave off |
The teacher said that Columbus _______America in 1492.
| A．discovered | B．found | C．had discovered | D．had found |
—When Tom________，please let me know.
—Mary said when Tom________，just tell her about it.
| A．comes；comes | B．came；came |
| C．comes；came | D．comes；coming |
—If you like the model car, you can _____ it. I don’t want it.
—Thank you very much.
| A．remove | B．carry | C．leave | D．keep |
My friend Jennifer, ____ help I’ve made great progress in my studies, will leave for Canada next week.
| A．in whose | B．in her | C．with whose | D．with her |
For some students, the computer serves only _____ a tool that is used to play games.
| A．of | B．in | C．as | D．to |