用括号中所给单词的适当形式填空

【1】My mother is behind __ (I)．

【2】Where __ (be)Lily and Betty?

【3】Our school has many __ (tree)．

【4】The __ (build)is very beautiful.

【5】There __ (be)50 chairs in my classroom.

【6】There are five __ (library)in my school.

【7】There __ (be)a pen and two books on the desk.

【8】All __ (computer)are in the teacher's office.

【9】There aren't __ (some) students in our classroom.

【10】—How many books __ there on the desk?

—There __ five books.(be)