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. ------- from the plane, the island looked very small.

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

5. He insisted that he -------- for everyone's lunch.

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