__________,we must believe in ourselves and believe that we can do something well.
| A．However life is difficult | B． However is life difficult |
| C．However difficult life is | D． However difficult is life |
In my opinion, it’s the best use that could be ______ this machine.
| A．made into | B．made from | C．made of | D．made with |
The fire was finally brought under control, but not______ heavy damage had been caused.
| A．before | B．after | C．since | D．until |
---Jane walked past me without greeting.
----She _____ you.
| A．can’t see | B．couldn’t see | C．can’t have seen | D．mustn’t have seen |
Mrs. Black doesn’t believe her son is able to design a digital camera, _____?
| A．is he | B．does she | C．doesn’t she | D．does he |
—Shall I lock the lab now before I go home?
—_____. I’ll check it myself later.
| A．Go ahead | B．No problem | C．All right | D．Don’t bother |