选出句子中的错误之处并改正。
( ) 1. There is a apple and an orange on the table.
A B C
( ) 2. There are a pencil and an eraser in the pencil-box.
A B C
( ) 3. There is two chicks and a duck on the playground.
A B C
( ) 4. —Is that a dog. —Yes, it's.
A B C
( ) 5. There are six days in a week.
A B C