______ is necessary for everyone to obey the traffic rules.
| A．That | B．This | C．What | D．It |
Small sailboats can easily turn over in the water ______ they are not managed carefully.
| A．though | B．before | C．until | D．if |
His movie won several awards at the film festival, ______ was beyond his wildest dream.
| A．which | B．that | C．where | D．it |
The Town Hall ______ in the 1800’s was the most distinguished building at that time.
| A．to be completed | B．having been completed |
| C．completed | D．being completed |
There is nothing more I can try ______ you to stay, so I wish you good luck.
| A．being persuaded | B．persuading | C．to be persuaded | D．to persuade |
After a knock at the door, the child heard his mother’s voice ______ him.
| A．calling | B．called | C．being called | D．to call |