Theassociationis________toraisingfundstohelptheblind.
A、conductedThefarmerhadtowearheavybootsinthewinterbecausethefieldsweretoowetand________.
Becareful,_______you'llfalldown.
ItwasthreeBritishsportsmenwho________banneddrugs.
Itisusefultoscience_______theearthasanobjectinspace.
It'smore________tobuyaseasonticketifyoutraveleveryday.
