Why问句与喜好表达 — 英语情景题

Read and complete the dialogue.（补全对话，每空一词） Sam: Hi, Lily! Which subject do you like best? Lily: I like Maths best. Sam: (1)________ do you like it? Lily: Because I like working (2)________ numbers. What about you? Sam: I like English. I like (3)________ English stories very much. Lily: Great! Let's read English stories together after school.