He was almost asleep, ____ with all this hard work.
A、worndownB
【句意】他干了这么多重活儿，累得精疲力竭，差不多睡着了。
【难点】wearout意为“使疲乏;使厌倦;使耗尽”;weardown意为“使消瘦，使厌烦”;wearoff意为“渐渐减少;消逝”;wearaway意为“消磨，打发，虚度;(时光等)流逝”。
Alltheir__havebeenshownupbytheirowndeeds.
Oneoftherequirementsforafireisthatthematerial____toitsburningtemperature.
Thecaris_____expensive_____hecan’tbuyit.
____thecenterofourplanetarysystemwasconsideredasheresybythechurchintheMiddleAges.
Tom,withhisparents______toAmerica.They_____backintwoweeks.
