I am playing football 
the school
A.onB.inC.at
Whose shoes 
these?
A.amB.isC. are
读一读，从方框内选出恰当的句子补全对话。 
读一读，选一选。（选择正确的答语，将序号填在括号里）
() （1）---Can you use a fork?
---________
( ) （2） ---Welcome to our school.
---________
( ) （3） ---Let’s open the red box.
---________
( ) （4） ---What would you like?
---________
( ) （5） ---Can I help you?
---________
—
，where's the book?
—I'm sorry. I don't know.
A. Excuse meB. I'm sorryC. Sorry