一、根据下列句子意思用所给词或所给首字母的正确形式填空
1. Children should spend more time taking exercise ________ (outdoor) and less time watching TV at home.
2. The journey took ________ (exact) three hours.
3. J. K. Rowling’s “Harry Potter” s________ for children has been amazingly successful.
4. Draw back those heavy ________ (curtain) and let some sunlight in.
