求以下虚拟语气练习题的答案（谢）
1. If he ______ finished his dinner a little sooner, he wouldn’t have missed the 8:30 train.
a. would haveb. wasc. had d. had been
2. Helen couldn’t go to France after all. That’s too had.
I’m sure she would have enjoyed it if ______.
a. she’s goneb. she’ll goc. she’d gone d. she’d go
3. Ring me up tomorrow so that I _____ remember to come to the meeting.
a. mustb. would c. mayd. were to
4. Whether the information ______ true or not, we must be vigilant.
a. beb. are c. wered. is
5. It is impossible to imagine how man ______ without the sun’s energy.
a. could live b. lives c. had livedd. is living