用括号内所给单词的适当形式填空。 I ________ (throw) down my bag and sat on the sofa because I was too tired. 2. My mother shouted at me ________ (angry), but I didn't know what happened . 3. I don't understand the text and neither ________ (do) my brother. 4. ________ (final) I finished the work with their help. 5. My brother ________ (lend) me his new bike last week.