The hamster's body clock

Hamsters have (0) ____need for alarm clocks. In the strange world of circadian rhythms – the 24-hour cycle (13) ____ governs almost every biological process in every living thing, (14) ____body temperature to digestion to sleeping and waking – the hamster is (15) ____equivalent of the Swiss watch. (16) ____to Professor Michael Antle from the University of Calgary's Department of Psychology, you can predict to within a minute (17) ____ a hamster is going to wake up. Humans, however, are more (18) ____ a cheap supermarket wall-clock, since their sleeping patterns are less reliable.

Professor Antle is studying the group of 20,000 cells in the brain that (19) ____ up the circadian clock. He's hoping to explain something astonishing that's happening to his hamsters. (20) ____turning on their light for fifteen minutes in the middle of the night, he can make them wake up an hour earlier the next day. But if instead he gives them a new drug that he's experimenting (21) ____they're (22) ____and about eight hours early. They will still need their usual fourteen hours' sleep, but their biological clocks appear to (23) ____been set back. When he saw the effect initially in his laboratory, Antle was shocked at (24) ____big it was. An eight-hour adjustment is something useful – it means that a hamster could be transported from its home in Canada (25) ____the way to London without suffering from jetlag.

If it could do (26) ____ for people, Antle really would be (27) ____ to something.

PART 3

For questions 28-37, read the text below. Use the word given in capitals at the end of some of the lines to form a word that fits in the gap in the same line. There is an example at the beginning (0). In the exam you write your answers IN CAPITAL LETTERS on a separate answer sheet.

Example: | 0 || P | R | О | U | D | | | |

Intrepid travel