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　　19. spring _________ 20. stamp _________  21. start __________

　　22. store __________ 23. strange _________ 24. such _________

　　25. suggest ________ 26. suppose ________ 27. surprise ________

　　二. 按要求写出下列词汇的变化形式。

　　1. sang _________ (动词原形)__________ (现在分词)

　　2. scientist________ (复数形式)

　　3. season _______(复数形式)

　　4. send __________(过去式)

　　5. seen _________ (动词原形)________ (动词过去式)_______ (现在分词)

　　6. slow __________ (比较级)

　　7. special _________(副词)

　　三. 根据句意，用所给词汇的正确形式填空。

　　1. If you are interested in ________(scientist) , you will become a ________ (science).

　　2. There are four _________(season) in a year.

　　3. It _________(seem) that you have no ways except studying.