. All the girls swam in the lake except two, who _____ halfway.
—Who’s that at the door? —is the milkman.
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.