读一读，选择正确的单词补全句子。
【小题1】I have _________ (second / two) pens.
【小题2】Can I have __________ (a / an) apple, please?
【小题3】My classroom is on the ___________ (first / one) floor.
【小题4】How many __________ (ruler / rulers) do you have?
【小题5】Let us clean the __________ (teacher's / teachers') office.

找出句子中错误的一处，并改正在横线上。
【小题1】How many student are there in your class? __________
【小题2】The teachers office is under our classroom. __________
【小题3】Do you have a art room in your school? __________
【小题4】—Is this your schoolbag?
—Yes, this is. __________

找出不同类的一项：(   )

A．in

B．on

C．an

There is _______ "f" and _______ "u" in the word "fruit".

A．an; a

B．a; an

C．a; a

D．an; an

选出不同类的单词：(   )

A．factory

B．the

C．hospital