Does Liu Hua ever guess the meaning of English words?,—He ______ guesses the meaning, of new words. He uses his dictionary all the time.

Mr Wang has lived here_____three years.[ ]

Is there any difference ____ these two sentences? [ ]

This is 3-D printer. And this is an artificial (人工的) ear. Can you believe that scientists printed this artificial ear by this 3-D printer?

Wang Gang wants to be ________ swimmer but Simon wants to be ________ engineer.