How many oxygen atoms are there in an ozone molecule?

Some people will interview the new president on TV.

Tornadoes can be moved objects as big as a car.

    A                          B                 C                 D     

Complete the second sentence in each pair so that it has similar meaning to the first one.

Volunteers have given out food and blankets to homeless people.

Combine two sentences using the words in brackets.

 Plastic bags are a major source of waste. We should not throw plastic bags everywhere. (BECAUSE)

Choose the word OPPOSITE in meaning with the underlined word(s) in each of the following questions.

In America, it’s not polite to ask questions about age, marriage and income.

At three o’clock tomorrow, we _____ a video conference in our office.

Ten new houses _____ in the town every year.

She drinks contaminated water. She suffers from a serious disease. (IF)

…………………………………………………………………………………

“I have just received a birthday gift from my mother today.” Nick said to me.

. Every day we hear about new _____ in science and technology.

What had you done before you _____ school yesterday?

I chose _____ by plane because it’s more convenient.

Choose the best option to fill in the sentences. Circle your answer.

It took firefighters five days to put out the _____.

Read the passage and choose the correct answer.

          Scientists have discovered that the ozone layer is getting thinner. Some predict that the sun’s rays will cause a sharp increase in deaths from skin cancer over the next fifty years. These harmful rays can also damage the eyes, create wrinkles, and cause other health problems.

​          The stratosphere contains a form of oxygen called ozone. Ozone is a molecule composed of three oxygen atoms. The chemical formula of ozone is 03. Oxygen molecules make up about 21% of all gases in the Earth’s atmosphere. They consist of two atoms of oxygen and are labeled 02. Most ozone found in our atmosphere is formed by an interaction between oxygen molecules and ultraviolet radiation (UV) from the sun. When ultraviolet radiation hits an oxygen molecule, it may cause the molecule to break apart into single atoms of oxygen. These single atoms are very reactive, and a single oxygen atom can combine with a molecule of oxygen to form ozone.