Exercise 9-2

The following sentences have errors in the use of relative clauses. Correct these errors by rewriting the sentences.
ประโยคต่อไปนี้มีข้อผิดพลาดในการใช้ relative clause ขอให้แก้ข้อผิดพลาดโดยเรียบเรียงประโยคใหม่

1. Nat King Cole was the only singer in that group who popularity lasted for several decades.
 
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2. It was after 6:30, which time the sun had usually already set.
 
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3. Mary wanted to have a quiet room to herself that she could study.
 
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4. That is excellent advice, which I shall have to remember it.
 
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5. It was unusual to see a science text that so well-written.
 
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6. Hank could not remember who car he had left his guitar.
 
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