Ⅰ. 根据句意及汉语提示完成单词（10分）
1. Our English teacher is in the __________ (办公室) now.
2. The students play in the __________ (操场) after class.
3. This __________ (建筑物) is science lab.
4. How many books are there in the __________ (图书馆)？
5. Our school is __________ (靠近) a river.
