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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