根据句意及首字母提示完成单词。

1. There aren't a_____ students in the room.

2. The tall b_____ is a hotel and there are a lot of rooms in it.

3. There is a big g_____ in our school and we often play basketball in it.

4.  —Where's my s_____ book?

     —It's in the lab.

5. Don't sit in f_____ of me.  I can't see the blackboard.