用所给单词的适当形式填空
1. The Changjiang River is the _______ (long) river in China.
2. Sue is a little ___________________ (beautiful) than her sister.
3. My room is not as _________ (big) as my brother’s.
4.--How difficult is physics?
--I’m not sure.
-- Is it ___________________ (difficult) than maths?
-- I don’t think so.
5. -- Annie plays the piano very ___________ (well).
-- Sue plays it _____ (well) than Annie. And Sally plays it the __________ (well).
（根据图片提示回答问题）
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