根据句意及首字母或汉语提示完成单词
①They are b____ the door. I can't see them.
②There are two blackboards on the classroom w____.
③ There are e____ people in the hall, forty women and forty men.
④There aren't a____ pictures in his room.
⑤There are two ____ (大门).
岩石是天然形成的石头，不是经过____的混合物。
Hi, I ________ Tom.
