pen/pencil/ruler/bag — 英语情景题

放学后，Tom 和 Lily 在教室里整理文具，每人拿起一样文具互相介绍。请从方框中选择合适的单词补全对话，每词只用一次。（备选词：pen / pencil / ruler / bag） Tom: This is my (1)________. I write with it. Lily: This is my (2)________. It is long. I draw lines with it. Tom: This is my (3)________. It is yellow. I write with it too. It has no ink（墨水）. Lily: This is my (4)________. I put my books in it.