—Are there any balls under the chair? —________.
—I’m afraid that I can’t do it.—Oh, you should believe in yourself. You won’t know what you can do______ you try it.
Before I talked with ______ scientist, I had never met______ clever person like him.
—Thank you for the nice meal you offered us! —_______.
—Are you _______ to go hiking with us?— Yes, I _______.
—You should be careful when _______.—Yes, I will. I’d like to know when ________ to have a rest.