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根据要求完成句子。

1.不管是谁,美国人都不喜欢用姓来称呼彼此,因为这样听上去太正式了。

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2.只有你保持均衡的饮食,你才能保持健康。(倒装)

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3.我们本来是可以轻易走出森林的,但是我们没有地图。(虚拟语气)

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4.在一些旅游景点,游客们经常被以各种手段敲竹杠,这已经引起了广泛的关注。(非限定性定语从句)

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5.科学家们宣称在癌症研究上已经取得了重大突破。(不定式)

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