III, 1. We were having dinner when the telephone rang.

2. We spent two hours repairing windows yesterday.

3. He detest joining social aactivities because he is introverted.

4. Hoa ethnic group has the colourful clothing.

5. My mother likes watching folk music and news on VTV1 channel.

IV, 1. Lang Lieu couldn't buy any special food because he was very poor.

2. During Tet, Vietnamese people buy all kinds of sweets so they make Chung cake as well.

3. We don't celebrate the festival if it costs too much money.

4. The tortoise was running while the hare was sleeping.

5. The girl worked hard although her stepmother wasn't happy.

6. The Buffalo-fighting Festival took place in Do Son last Saturday because there were so many people.

Cho mình câu trả lời hay nhất ạ

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II/
1. We were having dinner when the telephone rang.
2. We spent two hours repairing the windows yesterday.
3. He detests joining social activities because he is an introvert.
4. The Hoa ethnic group has the most colourful clothing.
5. My mother likes watching folk music and news on VTV1 channel.
IV/
1. Lang Lieu couldn't buy any special food because he was very poor.
2. During Tet, Vietnamese people buy all kinds of sweets so thye make Chung cakes as well.
3. If the festival didn't cost too much money, we would celebrate it.
4. The tortoise was running while the hare was sleeping.
5. Although the girl worked hard, her stepmother wasn't happy. 
6. Because the Buffalo-fighting festival took place in Do Son last Saturday , there were so many people.