（ ） comes back first is supposed to win the prize.

（ ） some mammals came to live in the sea is now known.

Our company’s service is （ ） in nearly 80 countries around the world.

Solar energy is a new kind of energy _____ that we can use to replace the traditional energy.

—I don’t drink coffee at all. —（ ）.

Do you mean this is the_____decision you have made after thinking for hours?

_____ that the earth was flat?

Send for a doctor quickly. The old man is badly hurt so he needs _____ at once.

The bad weather （ ） the building program by several weeks．

（ ） the past year as an exchange student in Hong Kong, Linda appears more mature than those of her age.

Mr. Phillips caught up with the boy in the corridor and （ ） his hand on his shoulder.

He clearly remembers _____ by the window watching people outside rushing to their office.