填入所给名词的正确形式。
（1）The ________are playing football now. (child)
（2） There are two ________in our school. (policeman)
（3） Could you please give me some ________? (milk)
（4） I want some ________for lunch. (tomato)
（5）I can see a lot of ________ on the grass. (sheep)
（6）June 1st is ________ Day. (child)
（7）May 12th is the International ________ Day. Let’s say “Thanks” to them for their work. (nurse)
（8）We’ve got a lot of new ________ in our school library. (magazine)
（9）It’s only about an ________ flight from Qingdao to Beijing by air. (hour)
（10）At the ________ of seven， the lonely girl had to work to make a living. (age)