1.Complete the table with the words.

(Hoàn thành bảng với các từ sau.)

Write down more words in the table.

2.Complete these sentences with the words given in exercise 1. 

(Hoàn thành các câu sau với các từ được cho trong bài tập 1.)

1 Amphibious buses can run on water                  land.

2 Fossil fuels help run machines,                      they cause pollution.

3                  solar energy is unlimited, not many people can cover its expense.

4 People should limit hydropower plants                       they sometimes cause terrible floods.

5 This seaside is full of sunlight,                              they will establish a solar power plant here.

6 Either solar energy                                wind power is useful and helps protect the environment.

3.Read the text and fill in each blank with the most suitable conjunction. 

(Đọc văn bản và điền vào mỗi chỗ trống với từ liên kết hợp phù hợp nhất.)

People always try to improve their standard of living, 1              they need a lot of fuels. 2                    a present day estimate by National Geographic says that we use 320 billion kilowatt-hours of energy every day, the need for energy does not seem to stop ending. Fossil fuels bring us a lot of energy, 3              they cause greenhouse gas emissions 4                       pollution. The time comes to find suitable and better replacements for fossil fuels. Solar energy, energy from wind 5                      bio fuels appears to be a promising source 6                                they can bring us a cleaner and greener future.

4.Use the most suitable conjunctions to make sentences. 

(Sử dụng các liên từ phù hợp nhất để viết các câu văn.) 

1 use/green sources / energy/ you / protect / earth

2 limit/use /fossilfuels /our future generations / lack energy

3 green sources / energy / good / we need more time / make / perfect (2 ways)

4 Việt Nam /a long seaside / suitable / develop /solar energy and wind power (2 ways)