Thefarmerhadtowearheavybootsinthewinterbecausethefieldsweretoowetand________.
A、earthy________ so many people in the United States been out of work as today.
He thoroughly understood the society __________.
In the future, more ______ should be placed on the education of the young.
Thewealthofacountryshouldbemeasured________thehealthandhappinessofitspeopleaswellasthematerialgoodsitcanproduce.
Itisusefultoscience_______theearthasanobjectinspace.
