Instruction

Select the best answer to complete the sentence.

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

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

3. The price of smartphones is now lower -------- the severe competition among electronics manufacturers.

4. The new project of R&D department is not moving -------- fast as we hoped unfortunately.

5. We had hardly arrived at the station -------- the train left.

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