47. B If the shirt fited me, I would buy it. ( if 2: If + S1 + V2/ed, S2 + would + Vinf )
48. B If he did not smoke too much, he could get rid of his cough.
49. C He was not rich enough to buy that expensive car. ( S + be + adj + enough + to V )
-> Anh ấy không đủ giàu để mua chiếc xe đắt tiền đó
50. D Although Tim graduated with a good degree, he joined the ranks of the unemployed.
-> Although + S + V: mặc dù, trong câu có "although" thì không dùng "but"