It's no good ________ here this morning. Come again on Monday.
| A．wait | B．waiting |
| C．having waited | D．to be waiting |
No matter when I look my miserable past, I feel sad and sorrowful.
| A．back | B．on |
| C．back on | D．upon |
They separated ten years ago and never met againthen.
| A．by | B．from |
| C．ever | D．since |
The disabled _____down upon in the past .
| A．was looked | B．were looked |
| C．looked | D．did look |
If you _____a crime you can never escape being punished.
| A．commit | B．discharge免除（自己的义务、负担等）； |
| C．take | D．do |
A clean environment can help the city bid for the Olympics, which in return will _____its economic development.
| A．add | B．increase |
| C．promote | D．plus |