题目内容
In my opinion, life in the twenty-first century is much easier than ________.
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Most birds find it safe to sleep in the trees, but ________they have eggs or young chicks, they don’t use a nest.
Leave your key with a neighbor ___ you lock yourself out one day
---Where’s that report?---I brought it to you ____you were in Mr. Black’s office yesterday.
All people,______they are old or young, rich or poor, have been trying their best to help those in need since the disaster.
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