Whatever amount you decided to ______, be certain that the money will be put to good use.

Studies show that people are more __________ to suffer from back problems if they always sit before computer screens for long hours.

Children need friends ________ their own age to play with.

— Could you give _______ an introduction to the new machine?— Of course. I will tell you how to use it. 

I’m so busy today that I can’t __________ the house.