—Kathy and her sister are so alike.—I can’t tell one from ____.
People have always been about exactly how life on earth began.
Nowadays senior high school students are burdened with too many ,which is making them less and less confident.
After the earthquake, the first thing the local government did was to provide _____ for the homeless families.
Duty is an act or a course of action that people _____ you to take by social customs, law or religion.
They controlled most of its land and made full use of its rich in iron and oil.