31. I suggest to do some more mathematical puzzles because it is interesting. A B C D 32. They was talking with each other in the youth club at present. A B C D 33. Nam’s father teaches him how to ride a bike when he was seven. A C C D 34. They got to know each other for more than ten years. A B C D 35. At first, she agreed for me about this plan, but then she changed her mind. A B C D

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