Dorothy was always speaking highly of her role in the play, ____, of course, made the others unhappy.
| A．who | B．which | C．this | D．what |
The girl looked at me with a _______expression. Maybe the problem was quite ______.
| A．puzzled; puzzling | B．puzzling; puzzled |
| C．puzzled; puzzled | D．puzzling; puzzling |
Would you please ______ your statement again? I don’t understand what you were saying.
| A．classify | B．clear | C．clarify | D．charity |
---How long has the United Nations ________?
--- ______1945.
| A．come into existence; In | B．been in existence; Since |
| C．been in existence; From | D．come into existence; For |
Dr. Black is a professor of chemistry. _______, he is a famous writer.
| A．In all | B．In brief | C．In fact | D．In addition |
The new invention may __________a lot of changes in our daily life.
| A．result from | B．expose to | C．lead in | D．contribute to |