任务型阅读
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.
根据短文内容，完成下列任务。
请将①处的句子翻译成汉语
请用适当的词替换②处的单词。
将③的单词组合成一个完整的句子(注意③处前是，）
将④处的短语译成英语
请回答下面的问题。
What does Da Shan think is the best way to learn a foreign language?
He thinks that the best way to learn a foreign language is ____________________