20. I am sorry to say that I won’t be able to meet you _____ to a sudden meeting? (A) because (B) due (C) since (D) for

4. According to the article, the “ice massage” can be defined as _______________. (A) Rubbing the area beside your eyes with cold fingers. (B) Spreading peppermint oil all over your face. (C) Putting ice cubes on the area which hurts most. (D) Dipping your head into some ice-cold water.