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.
Gun control is a subject ___________ Americans have argued for a long time.
He ___________ his friends for their help at the hotel now.
___________ I can see, there is only one possible way to keep away from the danger.
If you don't know his ___________, I think,it's very hard for you to get along with him.
She ___________ for three years and given birth to two children.