Instruction
Select the best answer to complete the sentence.
1. John is not used to -------- up late.
2. I went to the library, -------- find it was closed.
3. The amount of each employee's bonus is decided -------- the basis of his/her performance.
4. Are you going to postpone -------- a questionaire on our customers?
5. John could not but -------- at the fun.
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