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 |
— Can I make an appointment with Dr. Smith this afternoon?
— Sorry, I’m afraid he is not ______ because he has a patient to operate on.
| A．convenient | B．available |
| C．accessible | D．valid |
The disaster relief funds are already ______ so that people in the earthquake-stricken area can carry out reconstruction work without delay.
| A．in place | B．in demand |
| C．in order | D．in vain |
The Adulthood Ceremony was held in the school lecture hall ______ seats approximately 500 students.
| A．where | B．whose | C．which | D．when |
China’s e-commerce giant Alibaba had an amazing year as the Nov. 11 shopping carnival broke new records, the Double Twelve shopping day ______ with success.
| A．having followed | B．following |
| C．followed | D．to follow |
______ can be more exciting than the news that the Chinese national football team has reached the tournament knockout stage (淘汰赛阶段) at the Asian Cup.
| A．Nothing | B．Everything |
| C．Anything | D．Something |