-Do you think we can get there on time?
-Yes，_______ the truck doesn’t break down.
| A．even if | B．unless |
| C．until | D．so long as |
It may not rain, but you had better take an umbrella__________.
| A．in case | B．as well | C．as least | D．in need |
I'd like to be a professional singer, but I don't think I've got
| A．a good voice enough | B．a good enough voice |
| C．a voice enough good | D．an enough good voice |
___________she was invited to the ball made her very happy.
| A．If | B．That | C．When | D．Because |
He__________ he would be able to leave tomorrow, but it's beginning to took difficult.
| A．hopes | B．was hoping | C．had hoped | D．hoped |
—Why didn't you answer my phone when I phoned you at about 11 p. m. yesterday?
—I ___________and failed to hear the phone.
| A．might have slept | B．must be sleeping |
| C．might be sleeping | D．must have been sleeping |