The English teacher her students how to improve their comprehension skill since last week.
Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.
Today there are more airplanesmore people than ever before in the skies.
Unless some extra money________, the theatre will be close.
—I’m sorry for breaking the cup. —Oh, _________一 I’ve got plenty.
—I can't remember those grammar rules! —__________. Practice more.