根据句意及首字母提示补全单词 。 1. —Why are you so happy? —Because I r a letter from my father yesterday. 2. Why not give Nick a photo a as a birthday gift? 3. I want to get my sister something special for her birthday. Can you give me some s ? 4. I think this kind of TV program is boring. Would you mind c the channel? 5. P computers are widely used in Chinese homes today.