把两个简单句合成一个含有非限制性定语从句的复合句
【小题1】Mr. Smith made a speech this afternoon. Mr. Smith is from Australia.
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【小题2】Living in the Central Australian desert has its problems. The most serious one of them is finding water.
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【小题3】He bought a golden watch. The watch’s hands were made of gold.
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【小题4】We often borrow books in the library. The library was built 20 years ago.
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【小题5】He was born in 2001. His father worked in Guangdong that year.
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