4. The solar panels are expensive to buy. They save money in electricity bills later.

Read the text about Midnight City. Choose the correct answer (A, B, or C). (Đọc đoạn văn về thành phố Midnight. Chọn đáp án đúng (A, B hoặc C).)

MIDNIGHT CITY

At the moment, Midnight City gets over 50% of its energy from non-renewable sources. Twenty percent of its energy comes from coal. It's cheap to use, but it (1) a lot of pollution. It also gets 28% of its energy from nuclear power plants. Nuclear power is clean to run. However, it can be very dangerous. Midnight City also gets 9% of its (2) from natural gas. Natural gas causes some (3) and it is non-renewable. Midnight City could stop using these non-renewable sources and start using (4), renewable energy sources. Solar panels need a lot of sun, but it isn't very sunny in Midnight City. Solar power would not be a good choice. Midnight City is next to a large river and it is very windy there. Wind power (5) hydropower could both be good choices for the city.

Listen to Steve talking to Alice about energy. For each question, choose the correct answer (A, B, or C). You will hear the conversation twice. (Hãy nghe Steve nói chuyện với Alice về năng lượng. Đối với mỗi câu hỏi, hãy chọn câu trả lời đúng (A, B hoặc C). Bạn sẽ nghe cuộc trò chuyện hai lần.)

Fill in the blanks with the words from the box. (Điền vào chỗ trống với từ trong hộp.)

1. … are expensive to buy, but they save a lot of money by taking energy from the sun.

Circle the word that differs from the other three in the position of primary stress in each of the following questions. (Khoanh tròn từ khác với ba từ còn lại ở vị trí trọng âm chính trong mỗi câu hỏi sau đây.)

Combine the sentences using “and” or “but” (Viết lại câu sử dụng “and” hoặc “but”.)

1. Coal isn't very clean. It keeps us warm in the winter.

4. Non-renewable energy sources like coal causes a lot of … which is bad for the environment.