There will still be lots of challenges if we are to ______ garbage in a short time．（ ）
| A． |
clarify |
B． |
justify |
C． |
satisfy |
D． |
classify |
Many lessons are now available online，from ______ students can choose for free．（ ）
| A． |
whose |
B． |
which |
C． |
when |
D． |
whom |
﹣The movie start at 8：30，and we can have a quick bite before we go．
﹣﹣ ．See you at 8：10．（ ）
| A． |
So long |
B． |
Sounds great |
| C． |
Good luck |
D． |
Have a good time |
I had as much fun sailing the seas as I now do with students．（ ）
| A． |
working |
B． |
work |
C． |
to work |
D． |
worked |
I have always enjoyed all the events you organized and I hope to attend in the coming years（ ）
| A． |
little more |
B． |
no more |
| C． |
much more |
D． |
many more |
George _________ too far．His coffee is still warm．（ ）
| A． |
must have gone |
B． |
might have gone |
| C． |
can't have gone |
D． |
needn't have gone |