_____ the front door _____, he had to enter the room through the back door.
| A．Seen; painted | B．Seeing; painted |
| C．Being seen; being painted | D．Seeing; being painted |
Many people agree that________knowledge of English is a must in________international trade today.
| A．a；/ |
| B．the; an |
| C．the; the |
| D．/; the |
I have no idea if he________the meeting.
| A．will attend |
| B．attends |
| C．will have attended |
| D．would attend |
—When________again?
—When he________， I'll let you know.
| A．will he come; will come |
| B．he comes; comes |
| C．will he come; comes |
| D．he comes; will come |
You should make it a rule to leave things________you can find them again.
| A．when |
| B．where |
| C．then |
| D．there |
After swimming in the sea, they came out of water and lay on the________for a rest.
| A．bank |
| B．coast |
| C．seaside |
| D．beach |