Worldwide markets get tighter and the pain only lasts longer ______ international cooperation is strengthened in no time.
| A．because | B．if | C．unless | D．when |
The magazine you lent me ______ among the 10 most popular ones in our school.
| A．named | B．belonged | C．listed | D．ranked |
Professor Smith, along with his assistants, ______ on the project day and night to meet the deadline.
| A．work | B．working | C．is working | D．are working |
Class regulations require ______ is the last to leave the classroom ______ off all the lights.
| A．who; should turn | B．whomever; turn |
| C．whoever; turning | D．whoever; turn |
He was not really in the mood for anything ______ it dawned on him that it had not been his fault.
| A．since | B．when | C．after | D．until |
No progress was made in the trade talk as neither side would accept the conditions of ______.
| A．others | B．the other | C．either | D．another |