He thought that painting copied by a modern artist was ______ great value and bought it ____ over a thousand dollars.
| A．at; for | B．of; for |
| C．of; at | D．for; by |
“When did he leave the classroom?” “He left _______ you turned back to write on the blackboard.”
| A．the time | B．the moment |
| C．until | D．since |
“Will he agree to come to join us in the work?” “No, _______ we promise him more money.”
| A．when | B．unless |
| C．unless | D．as soon as |
“Would you mind my sitting here with you?” “No, ______ you aren’t too noisy.”
| A．when | B．if |
| C．unless | D．as soon as |
“Shall Mary come and play computer games?” “No, _______ she has finished her homework.”
| A．when | B．since |
| C．unless | D．as soon as |
_______ the sun rising slowly in the east, the scene is a perfect dream.
| A．Seeing | B．To be seeing |
| C．When you see | D．Having seen |