3. a) Some nouns from the article are missing from the definitions below. How many can you find without looking back at the article?
1) population (n.) [U] - all the people who live in one area, city or
country.
(n.) [U] - a process of making water, air, soil, etc.
dirty.
3)
(n.) [U; C] - when sb or sth becomes impossible
to see or find.
(n) [C] a person who carefully studies the topic
to find new facts or information.
5)
(n.) [U] - the process of something being made
4)
worse.
6)
7)
8)
(n.) [U] - the state of being safe and protected
from danger.
(n.) [C; U] - a rise in the number.
(n.) [U] - physical harm to something that makes
it less attractive or usefu
b) Look back at the article and check your answers.
2. Look (Present Simple) ! That man over there is wearing (Present Continuous) the same sweater as you.
3. Your son is (Present Simple) much taller than he was (Past Simple) last year. He has grown (Present Perfect) a lot.
4. I still don’t know (Present Simple) what to do. I haven't decided (Present Perfect) yet.
5. We can go (Present Simple) out now. It is not raining (Present Continuous) anymore.
6. What speed was the car doing (Past Continuous) at the time of accident?
7. I wasn’t (Past Simple) very busy at weekend. I did not have (Past Simple) much to do.
8. Mary usually phones (Present Simple) me on Fridays but she did not phone (Past Simple) me last Friday.
9. When Sue heard (Past Simple) the news, she was (Past Simple) very pleased.
10.What were you both doing (Past Continuous) at 7 o’clock yesterday?
me, "If you (spill) salt, you should throw a little salt over
your left shoulder. If you (do not do) this, you (will have) bad
luck. If you (break) a mirror, you (will have) bad luck for
seven years."
2. I (will not speak) to him until he (apologizes).
3. Peter (will introduce) us to his friends as soon as we (
meet) them. 4. We (will go) to the station to meet Sergei when
he (comes) to St. Petersburg. 5. Don't go away until mother
(comes) back. Give her the note as soon as she (comes).
6. Wil you (go) to the library with us? — No, I won't . I (will stay)
here and (help) Jane with her grammar. I (will come) to the
library after I (finish). 7. Ring me up before you (come). 8. I (to speak) to Mary if I (to see) her today. 9. If
you (ask) me a difficult question, I (will be) nervous. If I (am) nervous, I (will make) a mistake. If I (make) a mistake,
the other students (will laugh) at me. If the other students (laugh) at me, I (will be) embarrassed. And if I (am)
embarrassed, I (will cry). So please don't ask me a difficult
question!