A stone hit _____ and he fell down on the ground.

Though computers can do a lot of work man can’t do, they can’t completely _______ human beings.

I’ve got a ticket to the ball game tonight.—Oh. How ___________ you __________ it

The tomato juice left brown ____ on thefront f my jacket．

Our government has tried many ways to _________ the smog haze(雾霾) problem. Maybe we’ll have a clearer sky in the near future.