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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