1) People have always studied living things ... their natural environment. 2) How does our environment influence ... our children? 3) I don't think people living ... isolation could be happy. 4) Ecologists study what happens ... different species of birds and animals. 5) What size ... shoes do you wear? 6) What are the relations ... the two families? 7) Young people often send e-mails ... each other. 8) Mr Brown is 92 years old but he is ... good health. 9) What's the number ... children in your family? 10) Nowadays people often travel ... air.

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