题目内容
It is difficult to ______ when water problems of the modern age began.
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They are amazed by the ______ tiny animals and plants living in the ice.
Fold the fabric and ______ the two layers together.
The coupon entitles you to ten cents off your next purchase.
Impulsive spending isn't an option, so plan your week's menu _______, making shopping lists for your ingredients（烹调的原料）in their exact quantities.
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