there is （）“a” and ( )“r”in the word "are"

The roof is a triangle. And there is a（ ） There is a bed,( )and( ) there is a key and a book there is （）“a” and ( )“r”in the word are there is a desk and two chairs ( )the desk,there is a ( )and some ( ). there is a pencil-case and some is there a health and safety committee There is a lot to see and do there There( )(is/are)a cat and (There( )(is/are)a cat and ( )(a/an)elephant There is a mother and a father还是There is a mother and father It is a fact that there is a _____（一代）gap between parents and children. There is a tree on my left,and there is a tree on my right,too.（改为同义句） it's( )And there is a(it's( )And there is a( ) on her face There is a pen and a pencil 还是There are a pen and a pencil there is a （c ） under the tree.let is go and sit on it there（ ）a hill and a lake near our house.a.is b.are c.were there（ ）a boy and a girl in the lidrary.A,are B,is C,am