1. Complete the following word diagrams. Use a dictionary, if necessary.

(Hoàn thành sơ đồ chữ sau đây. Sử dụng từ điển, nếu cần thiết.) 

2. Complete the following sentences with the words in the box. 

(Hoàn thành các câu sau đây với các từ trong khung.)

1. Darwin's theory of _________ has helped to explain the disappearance of some species and the _________ of others.

2. The saola and the rhino are considered _________ species in Viet Nam.

3. The giant panda's natural _________ is the bamboo forest. Giant pandas like to eat bamboo leaves.

4. Baby sea turtles are most _________ when they leave their nests and make their way to the sea. They are convenient targets for birds and other animals.

5. Mammoths and dinosaurs used to live on our earth quite a long time ago, but they are now _________.

6. _________ helps to maintain the balance of nature that we rely on for our well-being and benefit.

7. The World Wide Fund for Nature (WWF) is an organisation which is working on issues related to _________, research and restoration of the environment.

The future perfect (Tương lai hoàn thành)

1. Circle the correct verb form in each sentence. 

(Khoanh chọn hình thức động từ đúng trong mỗi câu.)

1. Our rescue centre (has released/will have released) 150 monkeys, deer and bears back into the forests by the end of this week.

2. You may not believe this, but this sea turtle is quite old. It (has lived/will have lived) in this marine park for 40 years. We (will have/will have had) a party to celebrate its birthday tomorrow.

3. Well, next time I see you, I expect you (will be finishing/will have finished) your report on the endangered saola.

4. If you come to see me at 7 o'clock tonight, I (will be watching/will have watched) a documentary about rhinos to prepare for my presentation tomorrow. So, you'd better come after 8. By then the programme (finishes/will have finished).

5. Jill is sick and can't work on her assignment about the blue whale's habitat. So she (hasn't completed /won't have completed) it by Monday. She needs to ask for an extension of the deadline.

2. Complete the sentences, using the present perfect or the future perfect. 

(Hoàn thành các câu, sử dụng thì hiện tại hoàn thành hoặc tương lai hoàn thành.) 

1. By next summer, our rescue team (save and take in) __________ hundreds of endangered animals.

2. Look at this cute little bear. It (live) __________ in the wildlife park for six months, and it'll be released back into the wild next month.

3. If you come to the conference on wildlife protection after 10 a.m., the most interesting presentation (finish) __________.

4. By the end of today, Kim (visit) __________ all of the animal rescue centres in the city.

5. I'll start writing my essay on protection of endangered species as soon as I (collect) __________ enough information.

Double Comparatives (So sánh kép)

3. Work in pairs. Discuss which word(s) in the box can be used in each gap.  

(Làm việc theo cặp. Thảo luận từ nào trong khung có thể được sử dụng trong mỗi khoảng cách.) 

1. The _________ time you spend on preparing for the test, the _________ scores you may get.

2. The _________ you practise speaking in your class, the _________ you are at public speaking.

4. Complete the sentences with the words from the box. One word can be used more than once. 

(Hoàn thành câu với từ trong khung. Một từ có thể được sử dụng nhiều hơn một lần.)

1. The __________ the pollution becomes, the __________ animals lose their natural habitats.

2. The __________ I study about endangered species, the __________ I worry about their protection.

3. The __________ the weather gets around the world, the __________ the polar ice caps will melt.

4. The __________ effort you make, the __________ the achievements you may get.

5. The __________ renewable energy sources we use, the __________ our living conditions will become.