题目内容

Intimeofseriousaccidents,____weknowsomebasicthingsaboutfirstaid,wecansavelives.

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Iwouldappreciateit____youcallbackthisafternoonforthedoctor’sappointment.

Itisknowntoallthat____youexerciseregularly,youwon’tkeepgoodhealth.

Theywillhelpyou____youmeetwithdifficulty.

Ididn'tjointhemyesterdayevening____Ihadtogotoanimportantmeeting.

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