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Class regulations require ____is the last to leave the classroom ___off all the lights.
| A．who; should turn | B．whom; shall turn | C．whomever; turns | D．whoever; turn |
This meeting room is a non-smoking area. I would like to warn you___________ that if you smoked here you would be fined.
| A．in general | B．in detail |
| C．in advance | D．in total |
He is so stubborn that once he makes up his mind , nothing can change it;_______, it’s no use arguing with him.
| A．therefore | B．however | C．besides | D．so |
____________Li Bai, a great Chinese poet, was born is known to the public, but some won’t accept it.
| A．That | B．Where | C．What | D．Which |
The park was full of people_________ themselves in the sunshine.
| A．having enjoyed | B．enjoying |
| C．enjoyed | D．to enjoy |
What is known to all is that up to now China has made a great___________ to preserving the peace.
| A．conclusion | B．comment |
| C．campaign | D．contribution |