Find the mistake each sentence

Tìm và sửa lỗi sai trong câu
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47. I found it wonderfully to travel abroad.
A B C D

48. Although the increase in air fares, most people still prefer to travel by plane.
A B C D

49. He failed the exams because his laziness.
A B C D

50. The policeman had driven ten minutes ago.
A B C D