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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