5. I recommend this book for an exam ______.                                                                                                                                    (revise)

6. Greg is rather ______ for our    team.   He      knows nothing about sailing. (suit)

7. Solar energy is plentiful and it can be replaced ______            .                                                           _______ (easy)

8. There are some ______ who never die in our mind.                                                                             _____ (music)

Ở nhiệt độ 25^oC, khi hòa tan 18 gam NaCl vào cốc chứa 50gam nước thì thu được được dung dịch bão hòa. Độ tan của muối ăn ở nhiệt độ trên là:

Hai nguyên tử M kết hợp với 1 nguyên tử oxi tạo ra phân tử oxit. Trong phân tử, nguyên tố oxi chiếm 25,8% về khối lượng. Tìm nguyên tố M

Câu 1. (1,5 điểm) Hoàn thành các phương trình hóa học sau, và cho biết phản ứng nào là phản ứng phân hủy, phản ứng nào là phản ứng thế?

a) ……… +………  H₃PO₄  

b)  KClO₃  ……… +  ………

c) ……… + …….. SO₂            

d) KMnO₄ ……… + ……… + ……….

e) Mg + HCl  ………  +………

f) Fe  + H₂SO₄  ………  + ……… 

g) BaO + H₂O  ……

Have you ever entered a tropical rainforest? It's a special, dark place completely different from anywhere else. A rainforest is a place where the trees grow very tall. Millions of kinds of animals, insects, and plants live in the rainforest. It is hot and humid in a rainforest It rains a lot in the rainforest, but sometimes you don’t know it’s raining. The trees grow so closely together that rain doesn’t always reach the ground.

Rainforests make up only a small part of the Earth's surface, about six percent. They are found in tropical parts of the world. The largest rainforest in the world is the Amazon in South America. It covers about five million square kilometers. There are also rainforest in Western Africa, Central America, Southeast Asia, Northeastern Australia and the Pacific Islands.

Rainforests provide us with many things. In fact, the Amazon Rainforest is called the "lungs of our
planet” because it produces 20% of the world's oxygen. In the rainforests, we can see half of the world’s species of animals, plants and insects. Furthermore, 80% of the food we eat first and 2S% of the drugs we take come from rainforests. Some of these drugs are even used to fight and cure cancer. With all the good things rainforests give us. it’s surprising to find that people are destroying them. A lot of trees ore being cut - down and countless valuable species are being driven to the extinction. It creates many problems worldwide such as more pollution, less rain, and less oxygen for the world.

1. What is the main idea of the passage?

A. Kinds of rainforests                                                                       B. Where rainforests are located

C. Facts about rainforests                                                       D.  How much oxygen rainforests make

2. You would find a rainforest in_________.

A. North West America                                                          B. Southeast Australia

C. Northeast Asia                                                                                D. Western Africa

3. Why is the Amazon Rainforest called the “lungs of the planet”?

A. It helps us breathe                                                              B. It uses much of the world’s oxygen

C. It helps to circulate the air                                      D. It provides much of our air

4. What does the word “it” in paragraph 2 refer to?

A. the tropical part                                                                              B. the Amazon rainforest

C. South America                                                                                D. the Earth’s surface

5. The word “valuable” in paragraph 3 is closest in meaning to__________.

A. very useful and important                                      B. not precious enough

C. having to value                                                                               D. able be replaced