“Why couldn’t they meet us at five o’clock?” “Because they were delayed by _________.”
| A．heavy traffic | B．heavy traffics | C．crowded traffic | D．crowded traffics |
We _____ last night,but we went to appreciate the flowerbeds and streetlights in Tian’anmen Square instead.
| A．might study | B．could study |
| C．should have studied | D．must have studied |
Each of us, ____old or young,is a valuable member of society.
| A．however | B．whenever |
| C．whoever | D．whatever |
If a computer crashes,you will lose the file you _____ on unless you save it regularly.
| A．are working | B．work |
| C．will work | D．worked |
There you can see beautiful tall buildings on _____side of the square.
| A．all | B．either | C．both | D．every |
Only when you stay and live with___ local people for a period of time will you have
____better understanding of life here.
| A．a;/ | B．the;a | C．/;the | D．the;the |