As soon as I got on the bus I realized that I________ my papers in the house.
| A．left | B．was leaving | C．had left | D．have left |
__________ I have to give a speech, I get extremely nervous before I start.
| A．Whatever |
| B．Whenever |
| C．Whoever |
| D．However |
We are aware that，__________，the situation will get worse.
| A．if not dealing with carefully |
| B．if dealt not carefully with |
| C．if not carefully dealt with |
| D．if not carefully dealing with |
A man does not know the difficulty of anything __________ he does it personally.
| A．although |
| B．if |
| C．because |
| D．unless |
You can borrow my car __________ you promise not to drive too fast.
| A．unless |
| B．even if |
| C．in case |
| D．as long as |
__________ our manager objects to Tom's joining the club, we shall accept him as a member.
| A．Until |
| B．Unless |
| C．If |
| D．After |