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1. I
(encounter) many hikers who were headed to a distant campground with just enough time to get there before dark.
【考点】
一般过去时;
【答案】
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语法填空（单句）
普通
课时演练
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1. Once ecosystems pass their tipping point (临界点),it is
(remarkable) difficult for them to return.
语法填空（单句）
普通
2.
(prepare) others for a conversation of fun is as good as telling a joke yourself when showing your sense of humor.
语法填空（单句）
普通
3. Simply
(keep) a diary that keeps track of friends' birthdays and other important dates will make sure nothing slips by you.
语法填空（单句）
普通