My father is ________ the picture. (  )

A．look at

B．looking out

C．looking at

用所给词的正确形式填空。
【小题1】We should stop _________ (throw) rubbish into rivers.
【小题2】In the past, the Earth _________ (be) clean and beautiful.
【小题3】My brother is __________ (plant) trees in the backyard.
【小题4】The Earth __________(get) sick now.
【小题5】We shouldn’t __________ (cut) down so many trees.

The children are ______ ______ in the library.

In this photo, they are___________ (have)a birthday party.