1. The mother said she would __ her son washing the dishes if he could finish his assignment before supper.
　　A let down
　　B let alone
　　C let off
　　D let out
　　
2. This kind of material can __ heat and moisture.
　　A delete
　　B compel
　　C constrain
　　D repel
　　
3. Understanding the cultural habits of another nation, especially __ containing as many different subcultures as the United States, is a complex task.
　　A one
　　B the one
　　C that
　　D such
　　
4. In order to raise money, Aunt Nicola had to __ with some of her most treasured possessions.
　　A divide
　　B separate
　　C part
　　D abandon
　　
5. The new appointment of our president __ from the very beginning of next semester.
　　A takes effect
　　B takes part
　　C takes place
　　D takes turns

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