We may find that learning a foreign language does not have to be________learning our mother tongue,but can in fact be twice ________.
_____ that dress when he first saw you in the street?
He _____ English for ten years by the time he takes the examination.
I knew I could not finish the homework _____.
—Where is Peter? —He _____ to Shanghai.
My brother _____ the Youth League since 1990.