Dưới đây là các từ đúng để điền vào các chỗ trống trong đoạn văn:

1. **D reason** (The word "reason" fits best in this context, as it indicates the motivation behind the students' actions.)

2. **A part** (The phrase "took part" means to participate in something, which is appropriate for being involved in the radio show.)

3. **B range** (A "range" of projects refers to a variety of different types, which fits the context of various environmental projects.)

4. **A provide** (To "provide" food means to supply it, which is suitable for the context of planting trees to help wild animals.)

5. **D took** (The phrase "took care of" means to look after or manage, which is appropriate for caring for sick and injured wildlife.)

6. **B experience** (An "experience" refers to something that is memorable and impactful, which fits the context of the expedition.)

Đoạn văn đầy đủ sẽ là:

A group of Highfield Secondary pupils have worked extremely hard on a school expedition to East Africa. In **(1) reason** to pay for the expedition, the students decided to grow vegetables in the school garden, and then sold them to local shops, family and friends. They also took **(2) part** in a local radio show to advertise all the events they had organised to raise money.

These hard-working students have recently returned from East Africa, where they spent a month in a nature park working on a **(3) range** of environmental projects. The pupils planted trees to **(4) provide** food for wild animals, **(5) took** care of sick and injured wildlife in an Animal Rescue Centre, and helped to dig water holes for elephants. The expedition was an educational **(6) experience** that they will never forget.

1. B - plan
2. A - part
3. D - range
4. A - provide
5. C - care
6. B - experience