--The mistake_____, I had been more careful.
---But you weren’t at that time.
| A．might have avoided | B．would avoid |
| C．would be avoided | D．might have been avoided |
“How long do you suppose it is _______ he left for Japan?” “No more than half a month.”
| A．when | B．before |
| C．after | D．since |
Mr Zhang is mild in character. He never shouts ____ he is very angry.
| A．if | B．even |
| C．though | D．even when |
. John shut everybody out of the kitchen _______ he could prepare his grand surprise for the party.
| A．which | B．when |
| C．so that | D．as if |
_______ rich one may be there is always something one wants.
| A．Whatever | B．Whenever |
| C．However | D．Wherever |
______ I can see, there is only one possible way to keep away from the danger.
| A．As long as | B．As far as |
| C．Just as | D．Even if |