21: B
22: D
23: C
24: D
25: C
26: A
27: It is about 300km from Ho Chi Minh city to Phu Quoc island.
28: Traffic rules should be obeyed strictly by road users.
29: If you are be careful, you won't hurt your shelf.
30: They will be learning English this time tomorrow.
31: My brother doesn't like ice-skating because he thinks it is dangerous.
32: People won't use flying car until year 2050.
TEST 3:
6: B
7: B
8: C
9: A
