There isn´t /there aren´t

Choose the correct option:

• There is a cat under the computer

• There isn´t a cat under the computer

• There isn´t a ruler next to the colors

• There is a ruler next to the colors

• There aren´t three lamps in the bedroom

• There are three lamps in the bedroom

• There are some books in front of the desk

• There aren´t some books in front of the desk

• There isn´t a television behind the chairs

• There is a television behind the chairs

• There are two pictures in the living room

• There aren´t two pictures in the living room

• There isn´t a mirror in the bathroom

• There is a mirror in the bathroom

• There aren´t two beds in the bedroom

• There are two beds in the bedroom

• There isn´t a stove in the kitchen

• There is a stove in the kitchen

• There are five chairs

• There aren´t five chairs