Instruction
Select the best answer to complete the sentence.
1. If you have any questions about the project, please feel free to -------- us.
2. Our company specializes -------- producing speakers for car audio systems.
3. Please do not -------- your mother down.
4. It is impossible -------- human beings to predict the earthquakes at present.
5. How -------- does your wife go to Honolulu for a year ?
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