Ⅰ.用所给词的适当形式填空
1．If they ________________ (start) in the early morning，they would arrive in half an hour.
2．I was too busy then，otherwise I ________________________ (help) you do the work.
3．They talked as if they ________________ (be) friends for years.
4．The picture exhibition bored me to death；I wish I ________________________ (not go) to it.
5．I’d rather you ________ (post) the letter right away.
6．Without electricity，there ________________ (be) no modern industry.
7．If only they ________________ (tell) me what they’ve decided.
8．But for your help，the task ________________________________ (not finish) in time.
