Wind power is an ancient source of energywe may return in the near future.
| A． | on which | B． | by which | C． | to which | D． | from which |
—I wonder why Mr. Green hasn't showed up at the meeting yet.
—I'm not sure, but he __________ in a traffic jam driving here.
| A．could be stuck | B．might stick |
| C．might have been stuck | D．must have stuck |
__________ your timely warning, we would have been unaware of the danger.
| A．In spite of | B．But for |
| C．Instead of | D．As for |
We're trying to ring you back, Bryan, but we think we __________ your number incorrectly，
A. looked upB. took down
C, worked out D. brought about
It was a good concert—I enjoyed the last song __________.
A. in turnB. in particular
C. in advance D, in short
A good story does not necessarily have to have a happy ending, but the reader must not be left __________.
| A．unsatisfied | B．unsatisfying |
| C．to be unsatisfying | D．satisfied |