Instruction

Select the best answer to complete the sentence.

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

2. Cathy doesn't recommend -------- in that restaurant because the atmosphere is so bad.

3. I have -------- idea what to do next.

4. The world is -------- with the challenge of protecting the environment.

5. The amount of each employee's bonus is decided -------- the basis of his/her performance.

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