The girl ___on the ground ___to me that she had ____the book on the shelf.

Look out! The ceiling _____ l down

Even if these chemicals are still in experimental stages, they _____ to be a number one hit.

The first decade of the 21st century _____the breathtaking and non-stop development of China.

Hurry up! We have to get going. — Just a minute. I ________the paper.