Instruction

Select the best answer to complete the sentence.

1. The survey shows that the -------- of air pollution for residents is worse than expected.

2. You can complete the project without -------- difficulty only if you do it by next week.

3. We have been conducting an -------- research for about 5 years.

4. We are writing a specification in -------- to make the plan of a new job.

5. The survey was -------- out this week from Monday to Friday..

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