She knows so much about England. She ________ there before.
| A．must be | B．must have been | C．must live | D．must have lived in |
By the time we reach that page, we ___________ twenty lessons of the book.
| A．will study | B．will have studied | C．would study | D．have studied |
On hearing the bad news, he got up quickly ______ the lunch unfinished.
| A．leaving | B．left | C．to leave | D．leave |
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 |