Not until all the fish died in the lake __________ how serious the pollution was.
| A．did the villagers realize | B．the villagers realized |
| C．realized the villagers | D．do the villagers realize |
On the way home，he ________a storm.
| A．caught |
| B．was caught by |
| C．caught hold off |
| D．was caught in |
We took our umbrellas with us when we went out in order to ________us from a heavy rain.
| A．ban |
| B．preserve |
| C．prevent |
| D．protect |
Did the fire ________or was it________？
| A．go out；go out |
| B．go out；put out |
| C．put out；go out |
| D．put out；put out |
You shouldn't keep silent when________.
| A．speaking |
| B．spoken to |
| C．spoken |
| D．speaking to |
Doesn't it ________you as rather strange that he never talks about his family?
| A．beat |
| B．hit |
| C．strike |
| D．knock |