——Someone called you just now.
——I know. But I was busy at that moment. When I called back, there was no .
| A．voice | B．sound | C．answer | D．result |
This is______difficult problem that few students can work it out.
| A．so | B．so a | C．such | D．such a |
.He lives_______in the______village, but he is never_______.
| A．alone; alone; lonely | B．alone; lonely; lonely; |
| C．lonely; alone; lonely | D．lonely; lonely; alone. |
Pollution is a serious problem. Scientists have _______ some good ways to save it.
| A．come up with | B．come on | C．come out | D．come up |
We can’t put off _____ a plan .
| A．make | B．to make | C．making | D．to making |
I saw himwhen I passed by.
| A．ran | B．to run | C．runs | D．running |