Modern economics ________ the country ’s agricultural policies.

WhichofthefollowingisNOToneofthemainsourcesofnewwordsinthepresent-dayEnglishvocabulary?

Perseveranceisakindofqualityandthatis_______ittakestodoanythingwell.

Idiomsnominalinnaturehavea(n)______asthekeywordineachandfunctionasanouninsentences.

You should help them ________ when your friends quarrel with each other.