Chắc chắn rồi, đây là bài làm của bạn:

**Practice 1:**

1. We collected clothes and gave them to **homeless children**.
2. Those students picked up all the **litter** on the street.
3. We **donate** old textbooks to children in rural areas.
4. We helped **old people** in the nursing home last Saturday.
5. The club members **taught** math to primary students during school holidays.
6. Nick and his friends often **tutor** small children in their village.
7. We **planted** a lot of trees in the park last summer.
8. Tom and his friends **water** the plants in their neighborhood every weekend.

**Practice 2:**

1. concerned
2. attention
3. earn
4. gloomy
5. abuses
6. shelter
7. donate
8. ensure

**Practice 3:**

1. She has already made lots of friends in her new school.
2. The manager was forced to resign last month.
3. So far, they haven’t found a new library or school yet.
4. When problems come to my mind, I will be able to solve them easily.
5. I believe I can make a difference in people’s lives.
6. I was able to raise money and carry out these projects.
7. He should not be proud of his ability to memorize all these activities.
8. They recently gave us new computers in our school.

**Practice 4:**

1. She didn’t use to walking to the library. (longer)
- She no longer walks to the library.
2. Nobody could leave the building without a permit. (without)
- Nobody could leave the building without a permit.
3. I wish she could bring the bike herself. (by)
- I wish she could bring the bike by herself.
4. The magazine considers the band to play as a breakthrough. (according)
- According to the magazine, the band’s play was a breakthrough.
5. If we plant more trees, we can reduce air pollution. (by)
- By planting more trees, we can reduce air pollution.
6. The children sent thank-you notes to us a week ago. (received)
- We received thank-you notes from the children a week ago.