It’s quite normal to ten percent of the cost of a building for a period of six months or so, in case faults are found in it.
| A．keep up | B． keep away | C．keep off | D．keep back |
Why ____it get colder when we go up a mountain ?We are getting nearer to the sun !
| A．ought to | B．would | C．should | D． must |
If Alice ______this afternoon, the meeting should be put off.
| A．would not come | B．might not come |
| C．should not come | D．could not come |
It has been announced that candidates ( 候选人)_____remain in their seats until all the papers has been collected .
| A．can | B．will | C．may | D．shall |
What would have happened ______,as far as the river bank ?
| A．Bob had walked farther | B．If Bob should walk farther |
| C．Had Bob walked farther | D．If Bob walked farther |
_____the house Mr.Li has been broken into ?
| A．When was it that | B．When has | C．Has | D．had |