Macmillan English Grammar

f It/s possible that there will be some benefits for some people.

There ..

g It's possible that summers will become longer, and hotter, and winters will become

warmer.

Summers ..

h On the other hand, it's possible that some species of plants and animals will become

extinct.

On the other hand, some species of plants and animals ..

MIGHT

COULD

MIGHT

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a mustmightmustcouldAmightmay BBCC A
b

willwillcanltAmustcanAmightBBCC j
c

couldcouldmaymightmightAcanA BBCC k
d

canltcouldmustmaycouldAcanltA BBCC I
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canwillcancanltmightA mightBBCC mA
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canltmustcanltcanwillA mustBBCC n A

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willcanltmightmaycanA can'tBBCC o A
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maycouldAcan BC

Most of us enjoy a good night's sleep, but wea A,13 ... not

realize just how important sleep iso Everyone knows that without

sleep for a night or two, a person b... find it hard to think

well.After three nights without sleep, you c start to see

things, and you d begin to lose your sense of reality.ln

experiments, rats which are not allowed to sleep e ..

actually die, which seems to prove that sleep f be very

important. We know that children who do not sleep enough can

fail to grow properly, as growth hormones g be active

while the body is asleep. Lack of sleep h also damage the immune system, so you i

fali ill more often. Scientists don't know exactly what sleep is for and why humans need so much of it, but they

believe that itjH give the bodyachance to repair muscles and replace cells. It k.

also give the brain the opportunity to organize memory, and some experts believe that dreams I ..

help in this process.The brain also needs to rest, so sleep m give the brain a chance to 'recharge' its

batteries. Obviously, sleep n also be related to the fact that there are hours of darkness when our

activities are limited.Another possible reason for sleeping is that if we didn't sleep and save some energy, we

o have to eat a lot more food.

5 Chooseilllthe possible answers, A, B or C, for each gap.

1 Make some predictions about how your life could change in the next 20 years.

2 What do you think it must be like to be an astronaut? Use these ideas:food,

feelings, sleep, washing, how you spend the time, training.

Need morepractice7 Go totheReviewon page 192.

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