They are broadening the bridge to ___ the flow of traffic.
| A．put off |
| B．speed up |
| C．turn on |
| D．work out |
After graduation, she wanted to ________ her own business.
| A．set up | B．turn up | C．fix up | D．make up |
Tom took the police to the spot ________ the accident happened.
| A．which | B．that | C．where | D．when |
National Day ________ people singing and dancing happily in the street.
| A．saw | B．watched | C．observed | D．felt |
As there was no one she could________， she felt very helpless.
| A．turn to | B．turn on | C．turn off | D．turn over |
It was announced that only when the fire was under control ________to return to their homes.
| A．the residents would be permitted |
| B．had the residents been permitted |
| C．would the residents be permitted |
| D．the residents had been permitted |