______, the concert began.
| A．The listeners having taken their seats | B．Having taken their seats |
| C．Having taken their places | D．Taking their seats |
19．Why!Ihavenothingtoconfess._______youwantmetosay?
| A．Whatisitthat | B．Whatitisthat | C．Howisitthat | D．Howitisthat |
18．On October 31st, known as Halloween, dozens of children ________ costumes knock at their neighbor’s doors and yell “Trick or Treat” when the door ________.
| A．putting on; is open | B．dressed up in; opens |
| C．having on; is open | D．wearing on; open |
17．I don’t think he was happy although he lived in a rich family, _______?
| A．wasn’t he | B．was he | C．do I | D．don’t I |
16．In our village, about 1,000 meters north of my house, stands an old temple _______ the 17th century.
| A．dating back to | B．dated back to | C．being dated back to | D．to date back to |
15．You may ________ the textbook if you don’t know the answer to the question.
| A．refer to | B．deal with | C．look up | D．look into |