Instruction

Select the best answer to complete the sentence.

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

2. If it -------- to rain, the field trip would be postponed to next week.

3. May I have some more --------?

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

5. Hurry up!!! The meeting starts soon. We -------- be late.

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