There are so many tall trees in the forest, ______ .

Paper produced every year is ______the world’s production of vehicles.

. The Olympic Games _____ in Beijingin 2008. I hear it _____ in different countries every four years.

The boys were so angry that they went __________ something to eat.

Compared with her sister, Mary is even more ________ to, and more easily troubled by, what people think of her, so you’d better not say much before her.