27. It is about 300km from HCM city to Phu Quoc Island 

28. Traffic rules should be obeyed strictly (by road users). 

CT câu bị động với động từ khuyết thiếu: S + should/ can/ could/ may.. + be + VPII + ... 

29. If you are careful, you won't hurt yourself 

Câu ĐK loại 1: If + S + V (HTĐ) ..., S + will + (not) + V ..

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 cars until year 2050