I didn’t eat lunch, I feel hungry now

11. I didn’t eat lunch, I feel hungry now. => If I…………..………………………………….
12. It hadn’t rained, we would have a better crop. => But for……….……………………………………
13. If you want my advice,I would’t buy it. =>If I ………… ………………………………………
14. I only come if they invite me. => unless……………………………………………….
15. He didn’t revise all his lessons, he failed the exam. => If he………………………………………………………..
yêu cầu lm hết bài, pk có giải thích