____

____

Where are they?

    This is Tommy's bedroom(卧室). You can see a small bed 1the room. There's a toy(玩具)on the bed. You can see a light（灯）on the drawer. 2the photo? It's on the drawer，too. You can see 3on the chair. Where are the plants? They are4. The alarm clock, the pen and a cup 5on the table. 6you see a math book? Yes, it's on the floor. 

已知丙酮（CH₃COCH₃）键线式可表示为  ，则键线式为  的物质的分子式为 ____

    ～I think it’s        than English．