Once harm is ______ to the eco-system, all species will ______ , including man himself .
Thanks to the Internet, large quantities of information are now _____ to us in our home.
. Man must produce more grain to support the _____ growing population on earth.
The theory wasn’t accepted by many people when it was first ____, but it proved to be true as time went by.
He is good at maths and it won’t be long ____ he works out the problem.
—Learning a language isn't easy. It takes time.—I agree. _______. There's no short cut.