用所给动词的适当形式填空。 1. He hasn't _____ (finish) _____ (read) Harry Potter yet. 2. You _____ ever _____ (throw) things about, haven't you? 3. The film _____ (begin) before they reached the cinema. 4. The girl preferred _____ (walk) to _____ (ride). 5. She is looking forward to _____ (find) her lost book.