Exercise 4 - Part 2
For questions 1-8, think of the best word that fits each gap. Use only one word in each gap. All answers must be in lowercase.
Some of the gaps might have more than 1 answer, in that case, the system will detect it as incorrect, but will provide all the possible answers.
Most of us spend about a third of our lives asleep. (1) though we might feel that we are doing nothing while we sleep, our bodies are actually very busy. This is the time (2) our brains process information and our muscles repair themselves. If we go (3) enough sleep for a long period, it can have a serious effect (4) our health. We might find it hard to concentrate and become more likely to make (5) mistake at work or school. Scientists are still not (100) per cent sure (6) some people need more sleep than others. (7) is certain, however, is that getting a good night's rest is (8) vital importance for our general well-being.
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