数字与名词搭配 — 英语情景题

情景对话：Sam在整理书包（school bag），Lily来问他。 Lily: Hi, Sam! What's in your school bag? Sam: Look! I have books, pencils and rulers. Lily: How many books? Sam: I have (1)________ books.（提示：五） Lily: And how many pencils? Sam: I have (2)________ pencils.（提示：三） Lily: How many rulers? Sam: Only (3)________ ruler.（提示：一）