Instruction

Select the best answer to complete the sentence.

1. The survey shows that the -------- of air pollution for residents is worse than expected.

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

3. By -------- the explanation, the speaker was able to finish his speech as scheduled.

4. Mr.Blunt is thinking about ------- a hotel online for his next trip.

5. Kavin is -------- that he is in the right.

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