It is c_____ to tip the waiter in a restaurant in some Western countries
题目
It is c_____ to tip the waiter in a restaurant in some Western countries
It is c_____________to tip the waiter in a restaurant in some Western countries
certain OR certainly？
答案
certain
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我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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