Instruction

Select the best answer to complete the sentence.

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

2. John is not used to -------- up late.

3. I’m really busy and I -------- have any day off.

4. Mr. Beck's -------- knowledge about engineering and his remarkable problem-solving abilities should be respected.

5. Do not be afraid of -------- mistakes when you speak in a foreign language.

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