Instruction
Select the best answer to complete the sentence.
1. All of our products -------- to the standards set by a group of specialists.
2. Sopia was so smart as to solve the problem with --------.
3. It is impossible -------- human beings to predict the earthquakes at present.
4. I am planning to go sightseeing -------- my stay in Kyoto.
5. There must be something -------- with the air conditioner.
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