频率表达：always/usually/sometimes — 英语情景题

情景对话：Sam 和 Lily 在聊周末做的事。请从 always / usually / sometimes 中选词补全对话，使句子通顺合理。 Sam: Lily, what do you do on Sundays? Lily: I (1)________ go to the library. It is open every Sunday. Sam: Do you play basketball too? Lily: Yes, I (2)________ play basketball. I play it most Sundays. Sam: What about swimming? Lily: Oh, I (3)________ go swimming, only when it is very hot.