_________, the forest fire would have been discovered much earlier.
| A．But for their care | B．If they were careful |
| C．Without their care | D．Had they been more careful |
Many people agree that the electronic newspaper is a _____as great as the invention of printing, which will change our whole way of life.
| A．concept |
| B．consequence |
| C．decision |
| D．breakthrough |
Anyway, we shouldn't the law of nature and overuse the limited resources; otherwise, we will have to pay the price for it.
| A．give up |
| B．go against |
| C．break through |
| D．push ahead with |
He struggled his path of knowledge, so he _____to enter university:
| A．succeeded |
| B．managed |
| C．attempted |
| D．tried |
_____ reading may take up too much of your time, it is very helpful in raising your grades efficiently.
| A．Because |
| B．As |
| C．Once |
| D．While |
What do you think _____ if he knew the matter?
| A．to happen |
| B．would happen |
| C．to have happened |
| D．had happened |