--- The accident might not have happened , had we been more careful .
--- But we _______.
| A．didn’t | B．hadn’t | C．weren’t | D．don’t |
We were swimming in the lake _____ suddenly the storm started.
| A．when | B．while | C．until | D．before |
---Have you read the timetable ? ---Yes . The train ____ at 10:12 p.m..
| A．will start | B．is going to start | C．should start | D．starts |
Do you know __________ ?
| A．he lives where | B．where he lives |
| C．where does he live | D．where is he living |
The message is very important, so it is supposed _______ as soon as possible.
| A．to be sent | B．to send | C．being sent | D．sending |
Visiting _______ Great Wall is ________ unforgettable experience to me.
| A．/; / | B．/; an | C．the; an | D．the; / |