(1) Da Shan, a Canadian, is perhaps China's most famous foreigner. He speaks Chinese well. He was
 born in 1965. He (2) started to learn Chinese when he studied at Toronto University. In order to remember
more Chinese words, (3) wrote,he, them,often, on, cards, down, small. But he would only memorize words
 he met with while reading, listening or talking in the following two weeks. "There's no use learning words
that don't appear often," he said. "And the best way to learn a foreign language is to keep using it and
understand the culture behind it, Or you'll forget everything quickly." Da Shan says it is important to get into
the language environment. (4) 与中国朋友交谈has helped him learn not only the words, but also the country
and its people.
1. 请将(1)处的句子翻译成汉语。
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2. 请用适当的词替换(2)处的单词。
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3. 将(3)的单词组合成一个完整的句子。
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4. 将(4)处的短语译成英语。
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5. 请回答下面的问题：
    What does Da Shan think is the best way to learn a foreign language? 
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