请举出春秋战国时期的著名战役____。（至少两个）

某校七年级共320名学生参加数学测试，随机抽取50名学生的成绩进行统计，其中15名学生成绩达到优秀，估计该校七年级学生在这次数学测试中达到优秀的人数大约有（   ）

根据对话内容，从对话后的选项中选出能填入空白处的最佳选项，并将答案标号填写在本题下面相应题号后的横线上。选项中有两项多余选项。
—Now, tell me about the man who stole your neighbor’s car. What did he look like?
—Well, sir. He was tall…
— ____ 
—Oh yes, and he was younger than you — only about thirty, I’d say.
—Well! And what color was his hair?
—It was brown, and short… it was similar to yours, actually.
— ____ 
—No, He was clean-shaven.
—OK. Now have a look at these photos — can you see him?
— ____ 
—But that’s Frankie Famham — he’s got a beard, and he’s very short!
—Hm, well…
— ____ 
—Yes, the strangest thing was that he appeared to be a gentleman — he was wearing a suit… not like a thief at all.
—Hm, like this photo?
—Yes, that’s him!
—That’s Bill Mahony: he’s in prison! Are you sure you saw the thief?
— ____ 

你想买三把尺子，可以说：