https://www.liveworksheets.com/worksheets/en/Social_Science/Water/Water_Pollution_zt1512784ps

1. This newspaper is read (pres simp pass) by our students.
2. They are making (pres cont act) an interesting experiment now.
3. I will bring (fut simp act) you the book tomorrow
1. I knew (past simp act) that he had seen (past perf act) this film.
2. He said (past simp  act) that he lives (pres simp act) in this district.
3. He will read (fut simp act) your article when he has (pres simp act) the time.
1. Эту газету читают наши студенты.
2. Сейчас они проводят интересный эксперимент.
3. Я принесу вам книгу завтра.
1. Я знал, что он видел этот фильм.
2. Он сказал, что живет в этом районе.
3. Он прочитает вашу статью, когда у него будет время.

We use money every day to pay for things we buy.

Thousands of years ago, the money was not used. Instead, man had the “barter” system. This meant that if one wanted something he had, he had to find someone who had this thing. Then he had to offer him something in exchange. And if that person didn't like what he was offered, the first man couldn't get what he needed.

Over time, certain things were used as money, because virtually everyone would take these things in exchange. In the past people used shells, beads, beans, cocoa, salt, grain, tobacco, leather, and even cattle. But coins are much easier to use than, say, cattle. Them easy to store and carry.

They were first made from either gold or silver. They were imprinted with the brand name. Printing was showing how much each coin was worth.
Later, people began to use coins made of cheaper metals. Metal just had no value, but the coins still had value on the basis of printing, imprinted on them. People have also started to use paper money. No longer mattered that the money itself had no real value. This is the kind of money we use today.

Money has many forms. For example, this can be coins, bills or electronic money.
Coins is the money of small denomination. Previously, they were made of valuable metals, because the coin itself was valuable. Now they are made from cheap materials.
Due to the fact that a large number of coins was not convenient to carry, came up with paper money. They are made with special characters, so you can't fake them. First, a currency of mistrust, but then people got used to it and started to use.
Today electronic money has become one of the main ways of payment for goods and services. Electronic money is very convenient to pay for purchases in online stores. The first electronic money began to produce in 1994 in the United States. They have gained popularity and within a year took their payment system. Electronic money has become much more convenient. And the card was smaller than bill.

In the big shopping malls are not only shopping but also food courts where you can buy any food and drink what you want. Also, there are a variety of entertainment movie small parks. And for the convenience of visitors, many shopping centers are open until late at night in these centers have recreational areas with benches, decorations, special conditions for disabled elderly as well as in some stores for the convenience of the teller.