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4. Make the sentences from the text negative and interrogative.

1. “Evolution” really has two different meanings to biologists.

2. The term can refer to either as a process or an organizing principle.

3. Generally, the word evolution means change.

4. Biological evolution is a change in the features of individuals in a

biological population.

5. Lice infections were readily controlled through treatment with these

products.

6. It came into widespread use in that country.

7. According to the definition above, the lice have evolved.

5. Complete the sentences with the correct form of one of the verbs given below (the first is done for you) Pets

If you (1) (decide) have decided to buy a pet, you should find out as much as possible about the pet you (2) (choose).Cats (3) (be) easy to look after and(4) (seem) to be independent, but also (5)(need) the company of the people. If your cat (6) (find) someone, who (7) (care) for it more than you do, it (8) (change) owners!

A small puppy may (9) (look) like a suitable pet but do not forget that it(10) (grow) up. You may (11) (be) very happy with a very large dog that (12) (be) too big for its kennel and which (13) (like) to sleep on your bed! Unless you (14) (train) it, it may (15) (attack) people or (16) (bark) loudly day and night. Nobody (17) (love) a disobedient pet. Perhaps this (18) (be) why so many people (19) (keep) birds or fish as pets.

Whatever you (20) (decide) in the end, think carefully before you (21) (make) a decision.

6. Use Past Simple, Past Continuous, Preset Perfect or Past Perfect (the first is done for you)

One day in 1963, a dolphin named Elvar and a famous astronomer Carl Sagan, (1) (play) played a little game. The astronomer (2) (visit) an institute which (3) (look)into the way dolphins communicate with each other. Sagan (4) (stand) on the edge of one of the tanks where several of these friendly highly intelligent creatures (5) (swim). Elvar just (6) (swim) up alongside him and (7) (turn) on his back. The dolphin (8) (want) Sagan to scratch his stomach again, as the astronomer (9) (do) twice before. Elvar (10) (look) up at Sagan, waiting. Then, after a minute or so, the dolphin (11) (jump) out of the water and (12) (make) a sound just like the word “more”! The astonished astronomer (13) (go) to the director of the institute and (14) (tell) him about the incident. “Oh, yes. That’s one of the words he knows,” the director(15) (say), showing no surprise eat all.

Dolphins have bigger brains in proportion to their body size than humans have, and it (16) (be) known for a long time that they can make a number of sounds. What is more, these sounds (17) (seem) to have different functions, such as warning each other of danger.

7. Make up sentences, putting the words in the correct order and using the appropriate form of the verb.

1. Dane / to study English / till 4 o’clock tomorrow. 2. She / to check up tests / when you come. 3. The students / to take their exams / the whole May. 4. How many exams / these students / to take in May? 5. What article / to write / this month. 6. …you / to be / busy next weekend? I / to prepare / for my exam. 7. You / to have / any plans for May? 8. I / to write / my abstract the whole week.