选择下列单词或词组填入每句的空格中。每空格限填一词，每词只能填一次。
A. ground B. hard C. important
D. made of E. cook F. because
1．Forests are very ________ because they provide food for animals.
2．People in some countries ________ food with wood.
3．We get oil, metal and clay from the ________.
4．The scarf is ________ wood. It's soft and smooth.
5．Many animals in forests die ________ they lose their homes and food.
6．Jack is learning Chinese very ________ and he has made much progress.
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