Though he failed in the experiment again and again, he didn’t______, and at last, he made it.

Experts say walking is one of the best ways for a person to _____ healthy.

If your car isn’t insured, you may ________ losing everything when it hits something solid.

He is determined to devote himself to ___ the country.

The train ______ at seven o’clock and you’d better get to the station by half past six.