描述测量过程的方法 — 英语情景题

Read and complete the dialogue. Lily: Sam, how do we measure one minute without a clock? Sam: We can (1)________ our heartbeats and count them. Lily: OK. How do we measure a book? Sam: We (2)________ it with a ruler to get its length. Lily: What about a big bag of rice? Sam: We weigh it to find how (3)________ it is. Lily: I see. So we use different tools to measure different things!