13.C...28.C...43.A
14.B...29.D...44. viết pư ra
15.D...30.A...45.C
16.C...31.B...46.C
17.D...32.B...47.B
18.D...33.B...48.B
19.D...34.B...49.C
20.D...35.D...50.D
21.D...36.B...51.C
22.A...37.B...52.A
23.A...38.A...53.B
24.A...39.C...54.D
25.A...40.D...55.D
26.D...41.A...
27.D...42.D