If the researchers are successful, they an important step in reproducing the way that humans use cognition(认识力)to interact(交流;互动)in their world.
You ______ worry about their safety.They are old enough to take care of themselves.
We should make full use of whatever happens to us.There is always____ to learn from every experience.
------ Could you please tell me ______? ------ It’s next to the post office.
March is _____ month of the year.
------ What would you like, sir? ------ Two _____ bread and some coffee, please.