用所给词的适当形式填空。 1. The polar bear _____ (live) in the Arctic. 2. Let's _____ (go) to the zoo and see animals. 3. —Would you like _____ (come) to my home for dinner? —Yes, I'd love to. 4. The zoo has many _____ (wolf), polar bears and zebras. 5. Here _____ (be) some books.