—Kathy and her sister are so alike.—I can’t tell one from ____.
Nobody but us _____ the secret.
_____ of the land in that district _______ covered with trees and grass.
--I’d like to invite you to dinner this Saturday. --_______.
语音知识(共5小题,每小题1分,满分5分) skim
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If we _________ the earth, we must take action before it is too late.