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.
–Bill is warm-hearted and works hard.—________ his sister Betty.
–How can I operate this machine?—Well, just refer to the _______.
He threw away all the ______ cigarettes, _______ to give up smoking for the sake of his health.
Mandy, ___ university student from Canada, teaches us ___ history of western art.
He always works hard, but__________, he didn't pass the exam.