1.根据句意及汉语提示写出适当的单词.2.用恰当的句子补全下面的对话.

①This cake is ____（为）you.You can eat it .
②-Where is Mary?
   -She is in the ____（实验室）.

       ③____（科学课）is my sister's favourite.
       ④There are two white____（建筑物）in my school.
2.A:Goodmorning,Li Xiang.
   B:Goodmorning,Ma Jun.
   A:(1)_______________________
   B:There are twenty classes in my school.
   A:(3)_______________________
   B:Yes,there is a big library.
   A:And is there a sports hall?
   B:(4)_______________________We have PE in it .
   A:(5)_______________________
   B:It is on the left of the school gate.