“Underground” is the only word in the English language _____ begins and ends with the letters “und”.
—Are the black shoes ____? —No. It’s ____.
—What do you want to buy? —____
—____ is your teacher? —It’s Miss Gao.
—I’m busy. I can’t go shopping with you tomorrow. —_______
—Hi, Linda. _______ a hot day! Let’s go swimming, OK? —That’s a good idea!