III- 1.A→ strong enough                        2.C→ to study

C-1.She had difficulties in English

    2.Her teacher of English

    3.She told her how to use an English

    4.Yes, she did

D-1.Peter is not old enough to see a horror film

    2.Nien is younger than Hoa

    3.The teacher told me:"Go to the board, please"

III. 

1. A => strong enough (tính từ đứng trước enough)

2. C => to study (be going to + V_nguyên thể)

C. Reading

1. She had some difficulties in learning English.

2. Her teacher of English took her to the school library.

3. She to her how to use an English - English dictionary.

4. Yes, she did.

D. Writing

1. Peter is not old enough to see the horror film.

2. Nien is younger than Hoa.

Or: Nien is not as old as Hoa.

3. The teacher told me to go to the board.

4. Tuan said to Lan that she should practice English every day.