Instruction

Select the best answer to complete the sentence.

1. One of the engineers says there is a -------- of maintaining the system.

2. He seems to be -------- busy working to take a break.

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

4. I have a lot of -------- to do today.

5. There must be something -------- with the air conditioner.

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