1．If you have a good d____________， you may always feel fit and healthy.
2．Sorry, this box is too heavy. I don't have the s________ to lift it.
3．Out of c_____________， I asked an impolite question, “May I know your age？”
4．When c____________ go into a shop, they naturally look to their left but move clockwise, towards the right.
digestion
strength
curiosity
customers
