She felt emotionally d_____________ after her divorce.（使筋疲力尽；使疲劳）
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II. Fill in the blanks with correct prepositions or conjunctions.1. Are the doctors able to track ________ the cause of the infection?
I’ll tell _______ you when the teacher gets back.
I can’t work _______ how to do this.
They have many difficulties to reckon ________.
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