The passengers were ________in the traffic congestion which resulted from the accident ahead.
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 ________.
17.I don’t think he was happy although he lived in a rich family, _______?
16.In our village, about 1,000 meters north of my house, stands an old temple _______ the 17th century.
15.You may ________ the textbook if you don’t know the answer to the question.
14.Jim insisted that the book Mr. Black referred to ________.