—Happy birthday to you, Susan.—______.
Many people are waiting _____ the train ______ the underground station. A. for…at B. with…at C. to…in
—Would you like to help clean up the school yard? —_______. But I’m busy now.
You can’t put off _______ the book to the library because you can only _______ it for two weeks.
I want to know if the idea _______ she has thought up works out fine.
—_______ do you want to be when you grow up? —A professional singer.