Instruction

Select the best answer to complete the sentence.

1. Those services are available upon -------- for all of our customers.

2. It is said that women live longer than men -------- average.

3. The world is -------- with the challenge of protecting the environment.

4. I never said that taming a tiger would be a -------.

5. The cost of living has been -------- steadily for the last six months.

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