We didn’t know you were in trouble at that time,_____ we would have given you a hand.
| A．therefore | B．however | C．otherwise | D．though |
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 |
—Do you have any idea what your former boss would say about you?
—I don't know，________.
| A．so do I care | B．so I don't care |
| C．nor I don't care | D．nor do I care |