1. d , 2 b 3 d 4a 5 b
6. b, 7 a, 8 c, 9 b, 10 d ,11 d, 12 c ,13 a, 14 a ,15 b ,1 c ,17 d, 18 a ,19 d ,30 b , 21 a ,22 d ,23 d
26. c ,27 d ,28 a, 29 a ,30c .
31. ... is the coldest place in the world.
32. you should do morning exercise every morning.
33. my father will repair our house at tet.
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