Our school has used computers in teaching for ten years. As a result, not only______, but students become more interested in their lessons.
| A．has teachers’ energy been saved | B．saved was teachers’ energy |
| C．teachers’ energy has saved | D．was saved teachers’ energy |
Look at that little boy wandering about — perhaps he _____ his mother.
| A．will lose | B．is losing |
| C．had lost | D．has lost |
“Did Jim come?” “I don’t know. He _______ while I was out.”
| A．might have come | B．might come |
| C．mush have come | D．should have come |
“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”
| A．must; could | B．may; might |
| C．need; must | D．could; need |
“Show me your permit, please.” “Oh, it’s not in my pocket. It ______.”
| A．might fall out | B．could fall out |
| C．should have fallen out | D．must have fallen out |
“Is there a flight to London this evening?” “There _______ be. I’ll phone the airport and find it out.”
| A．must | B．might |
| C．would | D．can |