1. Man is a ___ being. A. raw B. ration C. rational D. ratio 2. The price of commodity should be determined by the ____ of supply and demand. A. principle B. rule C. law D. regulation 3. How did he ____to the news? A. function B. perform C. operate D. react 4. We thought they had come to repair the phone, but in ____they were robbers. A. reality B. addition C. future D. vain 5. You are not very ____if you expect a child to behave like a grown-up. A .reasonable B. true C. reality D. rational 6.I haven’t heard from her____ A. recently B. lately C. presently D. nowadays 7. Leave your key at ____ A. receive B. receiver C. receipt D. reception