______ we have enough evidence (证据), we can't win the case.
| A．Once | B．As long as | C．Unless | D．Since |
The fire _______ before the fire-fighters arrived.
| A．has been put out | B．was put out | C．had put out | D．had been put out |
With some snow on top of it,the Yellow Mountain looked fantastic this winter.Actually, I doubt whether we could visit ______mountian in China.
| A．a most beautiful | B．the most beautiful | C．a more beautiful | D．a beautiful |
---Would you mind letting me ______ your laptop for another two weeks?
----No problem.
| A．borrow | B．keep | C．lend | D．bring |
.It is well known that water is not _____ endless resource,nor _____ that can be made once more.
| A．the, / | B．an, one | C．an . that | D．/, one |
---Mom. I’m so tired. I can’t walk any further.
---______, my dear. You can make it.
| A．Come on | B．No worry | C．That’s impossible | D．No problem |