The class __________ 80 students is hard to manage.
--How about going for a walk? -- _____, but maybe it would be better to play cards.
Do you know the year _____Einstein died?
That is the reason _____I refused it.
This is the factory _____my father worked ten years ago.
The conference has been held to discuss the effects of tourism ______the wildlife in the area. A. inB onC. atD. with