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15. I don’t ride the bus to school every morning because it’s always so crowded.
=> If the bus ................................................................

17. It’s raining, so we can’t finish the game.
=> If it ...................................................................

25. I’m sorry I’m not able to go with you.
=> I wish .....................................................................

26. It’s a pity I can’t play the piano well.
=> I wish .....................................................................

30. I don’t know how to get access to the Internet.
=> I wish .....................................................................

32. Work hard and you will pass the exam.
=> If you .....................................................................

33. If you didn’t study harder, you would fail the exam.
=> Unless ...................................................................

35. If Tung didn’t drive carelessly, he would not have an accident now.
=> Unless Tung ................................................................

36. If Lan don’t start working now, she won’t be able to attend the meeting.
=> Unless ...................................................................