Dưới đây là dạng đúng của động từ trong ngoặc:

1. I think (swim) **swimming** is a great hobby.
2. They watched the (swim) **swimmer** splashing through the water.
3. They are too far out to (swim) **swim** to shore.
4. What does baking (helpfully) **help** Linh do?
5. Baking also (unhelpful) **helps** me relax after a busy week.
6. You may find it (helpfully) **helpful** to read this before making any decisions.
7. What are some (popularity) **popular** hobbies in your country?
8. In Britain, BSE was (popularize) **popularized** known as Mad Cow Disease.
9. When is the roller skating (compete) **competition**?