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1.①Her expression changed when she heard the news.
②Older people sometimes find it hard to accept changes.
③This information began to raise questions in her mind
about Jack's innocence.
④I don't think it's fair to question his motives just because he disagrees with you.
⑤Would you please dry my clothes in the sun?
⑥We will try our best to better our living conditions.
⑦He got first place in the final.
⑧She speaks Italian like a native.
2. hope→hopeful(有希望的)
success→successful(成功的)
use→useless(无用的)
power→powerless(无力的)
nature→natural(天然的)
tradition→traditional(传统的)
fame→famous(著名的)
danger→dangerous(危险的)
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(1)句①中的change通常用作动词，在句②中用作名词。
(2)句③中的question通常用作名词，在句④中用作动词。
(3)dry, better通常用作形容词，在句⑤和句⑥中dry, better都用作动词。
(4)final和black通常用作形容词，在句⑦和句⑧中的final和black都用作名词。
(5)名词加后缀ful，表示“满……的”，less后缀表示“无……的”。
(6)名词＋后缀al或ous构成形容词，表示“……的”。
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