Jane’s dad is getting old, so she has go back home to see him ______ it’s convenient.
—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.