根据汉语意思补上单词。 1. The boy is in the ______(电梯). He is going to the top of the building. 2. —What are you doing? —He invited me to his birthday party this Sunday. I want to write him a ______(感谢信). 3. His hobby is playing ______(曲棍球). 4. There are many ______ (婴儿) in the garden. They are playing happily. 5. He usually has lunch at ______(中午).