11. I__shouldn't___ have worn my best suit to the party yesterday; everyone else was very casually dressed.

12. "What are you doing this weekend?" "I haven't decided yet. I __may___go on a picnic with my family."

13. Can you repair my bicycle? -Oh, yes, I __will__do it now.

14. It's a secret. You mustn't____let anyone know about it.

15. I'm not sure. I _may__come a few minutes late.

16. Secondary school students nowadays__should / must __wear uniform.

17. I had read the book last night before I went to bed. I never took it out of this room. It __must be__lying around here somewhere. Where__should_ it be?

18. When you have a small child in the house, you __shouldn't_leave small objects lying around.

19. You ____should__ take your umbrella along with you today. It_may / might____rain later on this afternoon.

20. I __must__be at the meeting by 10 pm I will probably ___have to___take a taxi if I want to be on time.

1. once a year.

2. They use wet cloths to make the product surface smooth.

7. Will she be on the beach next weekend?

8. I think I and my brother will be at school.

9. We will have seafood and noodles for dinner.

10. Will they visit islands on Sunday?

1. I think I'll build sandcastles tomorrow.

2. She will go for a picnic with her classmates next week.

3. When will you explore the caves, Hoa?

4. My family will take a boat trip around the islands.

5. I will go to Da Lat with my family next Saturday.

6. Tomorrow afternoon, the children will play soccer in the playground.

1. Last year, many volunteers went to flooded area and gave free food to people.

2. They helped people rebuild houses and also plant trees.

3/ Many generous people donated money for poor people.

4. When I wasa student, I often joined charitable work.

5. I used to travel with my friends to remoted areas to help people there.

6. We stayed in the mountainous areas for weeks.

7. We taught the children there to read and write.

8. Being a volunteer/ was/ a/ wonderful experience.

9. After I graduated, I was very busy.

10. Now I still do charity in my hometown/./

Homework is being done by the students right now.

English is spoken all over the world.