It’s required that mineral resources_______ hand in hand with the local environment protection.

If you had joined the chat room ten minutes ago, you _____________what we were talking about.  

—The room is so dirty, _____ we clean it?—Of course.

—I _____ thank you enough for what you have done for me. —You’re welcome.

—Ms Lin looks rather a kind lady.  —But in fact she is cold and hard on us. You ____believe it!