B1 : Use UNLESS instead of IF ( Sử dụng cách của lớp 8 ) 1. I'll be able to do any work if i do now have a quiet room . 2. The flood would have been ruined if the flood had risen higher. 3. If you hadn't sneezed , he wouldn't have known that we were there. 4. If she did her hair differently , she would look quite nice. 5. If John had played for our football team , we would not have lost the game. 6. If i won the first prize in a lottery , I'd give up my job.