Certainly, let's fill in the blanks:

1. Mona Lisa is a famous masterpiece, which was painted by Leonardo da Vinci.
2. Healthy habits help us keep fit and avoid disease.
3. What do you usually do on the summer holiday?
4. Yesterday, we picked up litter around our area and recycled them.
5. This painting is prettier, but it is not as expensive as the other one.
6. I have to go to the market now. There isn't much food for our dinner.
7. Trinh Cong Son is one of Viet Nam’s greatest composers.
8. Community service allows students to develop themselves.
9. Young people like taking photos and post them on social media.
10. You can use this glue to stick these pieces of color paper to decorate your dollhouse.
11. Did you read the books to the elderly?

I hope this helps! Let me know if you have any other questions.

1. Mona Lisa is a famous masterpiece, which was painted by Leonardo da Vinci.
2. Healthy habits help us keep fit and avoid disease.
3. What do you usually do in the summer holiday?
4. Yesterday, we picked up litter around our area and recycled them.
5. This painting is prettier, but it is not as expensive as the other one.
6. I have to go to the market now. There isn't any food for our dinner.
7. Trinh Cong Son is one of Viet Nam's greatest composers.
8. Community service allows students to develop themselves.
9. Young people like taking photos and posting them on social media.
10. You can use this glue to stick these pieces of color paper to decorate your dollhouse.
11. Did you read books to the elderly in the nursing home last Sunday?
12. When gardening, students learn to wait for the plants to grow to maturity.
13. He bought me a big teddy bear on my birthday last week.
14. Someone threw away a pile of rubbish on the pavement yesterday.
15. Trang often uses glue and cardboard to build her dollhouse.
16. When children take care of their pets, they learn how to take on responsibility.