Choose the right word:

1. My daughter is still a teenager. She is only ... .
2. It happened in the middle of the ... century.
3. My ... house will be smarter than the first one.
4. The librarian was surprised to see such a small child. "Are you here for the ... time? Would you like me to find a nice book with lots of pictures for you?" she asked.
5. She took a deep breath and walked up the steps to school. She went straight into her ... grade classroom.
6. Today's the ... game.
7. The doctor examined her. “It's the ... sick child since morning. The symptoms are the same. It's the flu.”