Instruction

Select the best answer to complete the sentence.

1. Please refrain -------- using a mobile phone.

2. Because they have been introduced to --------, he already knows who she is.

3. Our company specializes -------- producing speakers for car audio systems.

4. He had no cellular phone with him, so he -------- to call his wife.

5. I ------- his behavior in the waiting room to see how he communicates with others.

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