He's been with the company ........ the summer.

(A) since

(B) for

(C) at

She's going on holiday ...... Xmas.

(A) in

(B) on

(C) at

The Black Death occurred ..... the Middle Ages.

(A) in

(B) on

(C) at

I'll be working ...... the summer holidays.

(A) on

(B) during

(C) while

Leaves fall ..... Autumn.

(A) in

(B) on

(C) at

She was Prime Minister ....... ten years.

(A) in

(B) for

(C) since

The law was changed ..... the nineteenth century.

(A) in

(B) on

(C) at

He'll be here ..... a moment.

(A) in

(B) on

(C) at

Term finishes ..... a Thursday for some reason.

(A) at

(B) in

(C) on

Their wedding is .... the eleventh of July.

(A) in

(B) on

(C) at