1 . The key to becoming happy is________ you treat your life and work. （用适当的词填空）

2 . And this is, when my taxi driver told me, ________ I now call, “The Law of the Garbage Truck.”(用适当的单词填空)

3 . If you often feel tired and can’t focus your attention, that is ________ you have to stop working too hard and to have a rest. (用适当的词填空)

4 . Air pollution is ________ most Chinese people are concerned about nowadays, because their health is being threatened. (用适当的词填空)

5 . The most pleasant thing of the rainy season is __________ one can be entirely free from dust.

6 . One of his first findings was ___________articles in the science section were much more likely to make the list than non-science articles. (用适当的词填空)

7 . The second reason is _________people are living longer. A child born in the US today has a very realistic chance of living beyond 100 and needs to plan accordingly. (用适当的词填空)

8 . The truth is ___________we are lucky enough to have clean water whenever we want, but this is not the case for many people around the world. (用适当的词填空)

9 . The reason why the ponies here are naughty is __________ Haytor is a tourist-heavy area and tourists are constantly feeding the ponies foods, despite signs asking them not to. (用适当的词填空)

10 . What they found was _________people wearing white coats performed better than those who weren’t. (用适当的词填空)