单项选择题
The postcard is sent by（）
A. a friend of my sister B. a friend of my sister's C. my sister friend D. my sister friend's
单项选择题 You may come on Monday or Tuesday. （）day will do.
单项选择题 Speak louder, （）you won't make yourself heard in such a big room.
单项选择题 （）will he finish his new novel In a couple of weeks, I think.
