c. I taught two children in grade 2 last summer.

d. He lived in Ha Noi ten years ago.

a. I dislike going fishing with my father.

b. He enjoys making models of small cars and planes.

c. There are 50 classrooms in my school.

a. She loves judo and goes to the judo club every weekend.

b. My best friend likes to go camping at the weekend.

Explanation:

• In sentence a, "love" should be changed to "loves" to agree with the subject "she".
• In sentence b, "go" should be changed to "to go" to form the correct infinitive structure after the verb "likes".