It’s hard to rescue drowning people because they ________ so much. 

—When Tom________，please let me know.—Mary said when Tom________，just tell her about it.

Nobody knows why the boy can tell what’s written on the paper in another room without looking at it. It really _______ explanation.

Mr. Green, who is a member of Labor Party, has _____ Mr Brown as President.

The girl _____ to be a good dancer if she is well trained in an art school.