It never occurred to humans until the mid-1990s ______ some animals can be cloned.
It is ___to be honest with your children
While waiting for you,I was watching TV in the hall
—Who should be responsible for the accident?—The boss,not the workers.They just carried out the order___
Her health___under the pressure of work
Chinese police___a terror(恐怖)plot aiming at the Beijing Olympics,and a fight crew stopped an apparent attempt to crash a Chinese plane in a separent case,official said on Sunday