Sure! Here are the completions for the sentences:

1. He was confident to say that he was the best student in his school.
2. There has been considerably since the introduction of Western culture.
3. I am excited about learning that I can come to visit my friend in Phu Yen next month.
4. Those children need to learn about how Vietnam has transformed itself.
5. Maya is sad because she doesn’t want to spend her holiday without her family.
6. I can help you review the lessons after school.
7. Everyone was enjoying the school festival.
8. People aren't allowed to smoke in public places.
9. The number of people learning English has dramatically increased.
10. Children in the past had less freedom of choice than children nowadays.