Câu trả lời:
21. Mr Ba rides his motorbike to work everyday.
Mr Ba gets to work by his motorbike every day.
25. The children are walking to school now.
The children are going to school on foot now.
26. Nam is tall. Hung is taller.
Hung is taller than Nam.
27. Let's go camping in Suoi Mo.
Why don't we go camping in Suoi Mo?
28. How much is a bottle of cooking oil?
How much does a bottle of cooking oil cost?
29. Nga usually walks to school.
Nga usually go to school on foot.