单句语法填空
1．Should it rain tomorrow, we would have to cancel the football match.
2．If you had just followed my advice, you would be better now.
3．Without/But_for your help, we couldn’t have finished the work ahead of time.
4．I was ill that day.Otherwise ，I would have taken part in the sports meeting.
5．I should have given you more help, but I was too busy.
