I.
1) Nam and his classmates played soccer yesterday afternoon.
2) I love watching colorful little fish in the aquarium.
3) Do you like sewing?-Yes, it's a useful hobby. I can wear what I can make.
4) The beaches in Nha Trang are really wonderful.
5) What a lovely dress ! Did you make it yourself?
Part 3:
1. spent → send
2. weeks → week
3. less → fewer
4. going → to go
5. bought → buy
6. little → few