Instruction

Select the best answer to complete the sentence.

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

2. I cannot -------- sorry for his friends.

3. He had no cellular phone with him, so he -------- to call his wife.

4. According to the research, persistent -------- of sleep has a negative influence on the metabolism.

5. Have you ever read detective stories -------- in English?

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