Instruction

Select the best answer to complete the sentence.

1. China changed significantly in the -------- half of the 20th century.

2. This vending machine is -------- of service.

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

4. It was one of the best concerts I've ever seen. You -------- seen it.

5. The sales department of our company -------- their sales strategies since last month.

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