Sometimes smiles ______ be false, hiding otherfeelings like anger, fear or worry.

Since you are in a hurry, why don’t you ______ for a taxi ______ stay here waiting for the bus

It is very important for us to_______ between good and bad

These doctors are busy day and night, a cure for AIDS.

Driving less, walking more is good for our health. –So I’d rather_____ an hour’s walk to work than consider ______ a car.