Idiomsnominalinnaturehavea(n)______asthekeywordineachandfunctionasanouninsentences.
By"languageacquisitionisprimarilytheacquistionofthegrammaticalsystemoflanguage",linguistsmeanthat______.
我感谢陆登庭校长的邀请，使我有机会在这美好的金秋时节来到你们这座美国古老而又现代化的学府。（）
Johnsonwas________unknownbeforerunningforthepresidency.
Thedelegation________RussiawillvisitLondonthisafternoon.
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