What is even more important is_____ the earth cooled down, water began to appear on its surface.

To work from home, which one could hardly imagine, has been made with the development of computer technology.

Although he’s over 70, he is full of energy.

Have you ever met with this case in your life 　　　　 you can’t understand others even if they have said something several times？

He filled the cup______ some milk.