Why stop walking, Michelle—There are so many people standing there that we can’t go

You had better ________ some time every day forsports so that you can keep yourself energetic.

You can certainly leave the classroom as soon as your homework__________.

Only then _______ how much damage had been caused.

A team of Americanscientists has found a treatment to protect humans from the deadly H5N1 fluvirus, ________ brings great ________ to the world.