＿＿＿＿being March 12th, they planted trees on the hill.

A.That　　B.It is　 C.It　　　    D.This

＿＿＿＿being March 12th, they planted trees on the hill.

A.That　　B.It is　 C.It　　　    D.This

_______ being Sunday, the library was closed.

    A. That　　　　　　 B. It is　　　　　　 C. It　　　　　　 D. This

__________ no need for us to discuss the problem again. It has already been settled.

   A. It has　　 B. There has　　 C. It is　　　　 D. There is

—Who is making so much noise in the garden?

　　　　—______ the children.

　　　　A. It is　　　　　 B. They are　　　　C. That is　　　　D. There are