Researches found several important (different) ____in the way boys and girls learn a foreign language.
When there is something serious wrong, people usually expect an apology.
A. 对
B. 错
The workers in the factory demanded that their pay should raise by 20 percent.
A. 对
B. 错
My personal view is that the price they offer is quite competitive.
A. 对
B. 错