根据句意,用括号内所给单词的正确形式填空。 1. 一I _________ (have) lunch when Bill knocked at the door. 2. He used to enjoy _________ (listen) to rock music. 3. Chinese tigers live in the south of China. They aye the _________ (old) typle of tigers living in the world. 4. The rainforests can give us a lot of _________ (use) things. 5.一Would you mind _________ (teach) me? 一Not at all.