Instruction

Select the best answer to complete the sentence.

1. I don’t know -------- to apologize to you.

2. It is impossible -------- human beings to predict the earthquakes at present.

3. Tom is looking forward to the event because he -------- effort for the preparation.

4. It is time you -------- to bed, John.

5. -------- we supply our products to over one million customers across the country, it is in our best interests to keep billing systems as efficient as possible.

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