______ a certain doubt among the parents as to the necessity of children's doing so much homework.
| A．It existed | B．There had |
| C．There existed | D．It had |
Would you please keep silent? The weather report and I want to listen.
| A．is broadcast | B．is being broadcast |
| C．has been broadcast | D．had been broadcast |
She spent a happy afternoon her coins and stamps she had collected those years.
| A．to look for | B．worked on |
| C．sorting out | D．watch over |
We have reached a point ______ a change is needed.
| A．when | B．with which | C．why | D．where |
Perhaps he is not quite fit for the job, but , please let him have a try.
| A．in fact | B．anyway | C．so | D．otherwise |
water will make the fish in the pond .
| A．Polluting; die away | B．Being polluted; die off |
| C．Polluted; die out | D．Pollution; die down |