--- Who taught you Japanese? --- Nobody, I learn it by _____.
—Would you like to go to the park with me? —I’d love to, ________ I’m afraid I have no time.
My favourite season is spring. It usually comes ______ March.
Tom and I are good friends. _______ often help each other.
—Lisa, do you remember ________ yesterday? —Of course.
Chinese ________by more and more people in the world now.