Soil pollution is also a (1)______ matter in all of the countries today. (2) ______ such as heavy metals, pesticides and solvents ooze into the earth’s soil and (3) ______ the food supply. Major health risks to entire ecosystems (4) ______ by soil pollution. It (5) ______ the amount of soil which is suitable (6) ______ agricultural    production and contributes to global food shortages. The (7) ______ of industrial waste products generates much of the world’s soil pollution, though natural disasters can also add to the problem. In some (8) ______ countries such as the US and UK, protection agencies monitor the food supply. The public is generally warned (9) ______            major health outbreaks occur. However, developing countries do not have this luxury. Farmers in poor nations grow plants for food in polluted land both to earn a living and to avoid (10) ______.

1. A. small                     B. main                         C. tiny                           D.  tight

2. A. contamination        B. contaminated             C. contaminants             D. contaminating

3. A. pollutes                 B. polluted                     C. pollute                      D. polluting

4. A. is causing              B. cause                       C. are caused                D. are causing

5. A. takes                    B. decreases                 C. gets                          D. has

6. A. in                          B. of                             C. for                            D. up

7. A. dispose                 B. disposing                  C. disposable                D. disposal

8. A. power                    B. powerful                    C. powerly                     D. powerless

9. A. during                   B. because                    C. although                    D. thus

10.A. starve                   B. starvation                  C. starving                    D. starved

Ex. 2: Choose the most suitable preposition to fill in the blanks.

1. Many scientists are concerned_______the environmental problems today.

A. in                           B. on                            C. about                        D of

2. The decrease_______ air pollution was dramatic last year.

A. in                           B. on                             C. of                             D with

3. They were well aware_______ the problem.

A. on                          B. to                             C. of                             D. up

4. I’ve come _______ an idea about the new project.

A. up to                       B. up with                      C. up on                        D. up in

5. Radiation can lead_______ childhood cancer,

A. to                           B. on                             C. of                             D. in

Ex. 3: Choose the most suitable word to fill in the blanks.

1. If I _______ a lot of money, I would buy a new house.

A. have                       B. will have                    C. had                           D. has

2. Water pollution makes some aquatic animals _______.

A. dying                      B. to die                        C. die                            D. died

3. If the weather is fine, we _______ the mountain together.

A. climb                      B. would climb               C. climbs                      D. will climb

4. Some local factories still continue _______ toxic waste into lakes and rivers.

A. dump                      B.to be dumping            C. dumping                    D. dumped

5. Let’s_______ the topic for the upcoming presentation,

A. discuss                   B. discussed                  C. discussing                D. to discuss

Xác định  công thức hóa học của chất A biết trong A có chứa thành phần % theo khối lượng các nguyên tố C,H,O lần lượt là 52,17% ; 13,04%; 34,79% . Biết tỉ khối hơi của A so với khí hiđro bằng 23.