Insomeschoolschildrenwhoprefertoreadbooksratherthan________footballbecomesocialoutcasts(被抛弃者).

Thefarmerhadtowearheavybootsinthewinterbecausethefieldsweretoowetand________.

Be careful, _______ you'll fall down.

Since William had been seriously ill for several months, his parents were worried about________ to return to school full-time.

ItwasthreeBritishsportsmenwho________banneddrugs.