A smile costs _________， but gives so much. So we should learn to smile.

The old couple often take a walk after supper in the park with their pet dog them. [ ]

Jack offered us a big meal when he wasleaving the office, but our work ____, we refused it.

The students are fed up with their studies because they are ________ to do far better than they can.

Taking some exercise every day will fat and make you fit.