POPULATION GROWTH RATES VARY AMONG REGIONS AND EVEN AMONG COUNTRIE...

22. Population growth rates

vary

among regions and even among countries within the

same region

A. come up

B. stay unchanged

C. remain unstable

D. go down

Read the following passage and mark the letter A, B, C or D on your answer sheet to

indicate the correct word or phrase that best fits each of the numbered blanks

It has long been suspected that lack of sleep can actually lead to illness, particularly in

young people. Research involving students aged 14-19 over a three-week period now

appears to confirm (23) ……... The teenagers wore devices that recorded the movements

they made, without being (24)... of them, that indicated they were asleep. The results

were then compared to the number of illnesses that they had (25)... from during the

three weeks, in addition to the number of occasions on which they had been absent from

school. What the study showed was that students who slept (26)... than seven hours a

night caught colds, flu and other relatively minor illnesses more often The problem is that

as children enter their teens their natural sleeping patterns change, (27) ………. in them

going to sleep later and therefore wanting to wake up later - but they still have to get up

in the morning to go to school.