In developed countries, farm workers _________ only a small section of the population.
Many people agree that the electronic newspaper is a _____as great as the invention of printing, which will change our whole way of life.
Anyway, we shouldn't the law of nature and overuse the limited resources; otherwise, we will have to pay the price for it.
He struggled his path of knowledge, so he _____to enter university:
_____ reading may take up too much of your time, it is very helpful in raising your grades efficiently.
What do you think _____ if he knew the matter?