Human beings are different from animals _______ they can use language as a tool to communicate.
The only existing problem is ____ we can find this special wood in the forest in such a short time.
The reason why they failed the test was ____ they didn’t sleep at all the night before.
The nurse was very kind to the boy at first, but finally, her ____ gave out and she lost her temper.
Lucy was called to ____ her stupid deeds the night before, but she couldn’t remember anything. A. pay for B. leave for B. account for D. look for
The editor could have ____ the error before it was published; it was so obvious.