根据下列句子的意思及所给的汉语提示,写出空缺处单词的正确形式(每空一词)。 1. I have _________(写) several invitations for my birthday. 2. How long did it ________(花费) you to do your homework last night. 3. Hi! You have spent ____ (1个半小时) in writing the letter! 4. He is sometimes late because he lives ________(最远) from the school. 5. I have never __________(听说) her, but she is one of my aunts.