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boring
dangerous
safe
popular
relaxing
enjoyable
Which one is easier? running or swimming?
Running is easier than swimming.
Swimming is _________________than running.
more difficult
复习：单音节和少数双音节形容词变比较级，一般规律：词尾以 er 结尾。
eg: long---longer
多音节和部分双音节形容词变比较级，一般规律：more +多音节和部分双音节形容词的原形。
eg: exciting---more exciting
说出下列单词的比较级形式
exciting ---------
expensive -------
popular ---------
relaxing --------
boring --------
interesting --------
easy --------
cheap -------
safe ---------
easier
cheaper
safer
说出下列单词的比较级形式
exciting ---------
expensive -------