Teachers recommend parents __________ their children under 12 to ride bicycles to school for safety.
| A．not allow |
| B．do not allow |
| C．mustn't allow |
| D．couldn't allow |
The computer systemsuddenly while he was searching for information.
| A．broke down | B．broke out | C．broke up | D．broke in |
___ the room, the nurse found the tape-recorder ___.
| A．Entering; stealing | B．Entering; gone |
| C．To have entered; being stolen | D．Having entered; to be stolen |
As we joined the big crowd I got _____ from my friends.
| A．separated | B．spared | C．lost | D．missed |
Scientists have many theories about how the universeinto being.
| A．came | B．was coming | C．had come | D．would come |
Mr. Leea plan to reduce water pollution, which all the people present at the meeting thought highly of.
| A．put off | B．put on | C．put forward | D．put away |