Fill in the blanks with the correct option from the choices given in the brackets:
(a) Slow and steady........ the race. (win/wins)
(b) The price of things .......... rising up. (is/are)
(c) Bread and butter .......... favourite food. (is/are/may)
(d) The building is under........(repair/repairs)
(e) One must keep..........promise.(his/one's)