It is Sunday today but my three good friends are not at home. Tina is at the mall. Is she shopping? No, she isn't. She is eating lunch with one of her friends. Mike is still at school. Is he doing his homework? No, he isn’t. He's playing basketball with other boys. What about Lisa? Where is she? She is at the library. She is reading a book. Is it an interesting book? Yes, it is. Lisa likes this book very much.

You can’t turn right when you see the sign _______. 
                  

某学生用图示的装置进行一氧化碳和二氧化碳混合气体的分离和干燥．其中a为铁夹，b为分液漏斗的活塞．

（1）甲瓶内盛 ____ 溶液，乙瓶内盛 ____溶液，分液漏斗内盛 ____溶液．

（2）实验先分离出一氧化碳，方法是先关闭　 ____　，再打开　 ____　．

（3）分离完一氧化碳后，再收集二氧化碳，方法是先关闭 ____，再打开 ____