他很小的时候就会骑自行车了。He was able to ride a bike _____ he _____ very young.
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他没有听见敲门，因为他正在听收音机。He didn’t hear the knock at the door ________ he______ ______ _______ the radio.
直到我叫他的名字，他才看见我。He _____ _____ me _____ I called his name.
既然你需要这本书，你就拿走吧。_____ _____ _____ the book, you may take it.
这就是那个帮助过我的人。This is the man _______ _______ me.
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