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?

Is that your watch? —Yes, ____.

Can I go to the movie, Mum?— Certainly. But you _______ be back by ten o’clock.

Where’s your Mom, Xiao Hong? ––She ____ to music in her room.

We shouldn’t be __________any difficulties. [ ]