The accident is reported to have occurred _____the first Sunday in February.

A. at             B on             C. in          D. to

 ---When do we need to pay the balance?

--- ____ September 30.

 Sorry, madam. You’d better come tomorrow because it’s _____the visiting hours.

 The conference has been held to discuss the effects of tourism ______the wildlife in the area.

A. in               B on              C. at         D. with

This is the factory _____my father worked ten years ago.

 That is the reason _____I refused it.

Do you know the year _____Einstein died?

--How about going for a walk?

-- _____, but maybe it would be better to play cards.

 —Have you moved into your new teaching building?

---Not yet. It ________.

The reason ____ she gave us for being late for school was ___ her bike broke down.