3. Atlantic ocean is the largest. Task 3. Complete the sentences. Use the Present Perfect or the Past Simple.
1. Tom (break)
his leg five days ago. He's in hospital. He (be)
in
hospital since he (break).
his leg.
2. I
(never/ be) to the USA. I (want) to go there last summer but
I couldn't.
3. Carol and I are old friends. I (know). her since I (be)
a freshman
in high school.
4. I (be) at the school since last September. At first I (not like) it because I (not have)
any friends here.
5. The first modern Olympics (take). place in Athens more than a hundred
years ago.

1. the poincaré conjecture.

in 2002, the russian mathematician grigori perelman proved the poincaré conjecture. this is a very serious discovery in mathematics. it was one of the seven tasks of the millennium. for this work, he received the prestigious fields medal, an analogue of the nobel prize in mathematics.

2. quantum clock.

quantum clocks are the most accurate chronometer in the world, surpassing all previously existing ones. nobel laureates of 2012 serge arosh and david wineland made a discovery that allowed to overcome the quantum barrier.

3. the discovery of eris.

the eris is the second after the massive pluto massive dwarf planet of the solar system. it was the discovery of eris from pluto that ceased to be the ninth planet, and passed into the category of "dwarf".

4. created the first synthetic bacterial cell.

in 2010, scientists from the craig venter institute created the first fully synthetic chromosome with the genome. when it was embedded in a bacterial cell devoid of genetic material, it began to function and divide according to the laws prescribed by the new genome.

5. higgs boson.

this was experimental evidence of the existence of the higgs boson. the practical significance of the discovery of the higgs boson is that scientists are opening up prospects for the development of anti-gravity and the development of engines that do not require energy to operate.

Поставьте глаголы в правильной форме.

1. If I (to be) you, I wouldn't (to go) to the party before an exam.

2. If we (to have) to choose, we should have come to New York City instead.

3. When it (to be) a December now, I will watch champion ice-skaters.

4. If I (to end) earler, I'll call him.

Закончите предложения, используя фразы.

1. If I could live anywhere, … a) if I had their number.

2. My father would feel better, … b) I'd live in Australia.

3. I'd phone them, … c) if you kept your room tidy.

4. If I found a lot of money, … d) I'd travel around the world.

5. You could find your keys, … e) if he gave up smoking.

6. If you studied hard, … f) I'd give it to the police.

7. If I were rich, … g) you'd pass the exam.