at a bargain price at a good price at a loss at a profit at cost price at last
at least at our expense at short notice at your disposal by accident by air
by e-mail by fax by letter by return of postlmail It wasn’t done intentionally, it happened ______

a. Mrs Scarlet agreed to investigate the cost of employing an outside agency to prepare publicity literature.
b. Mr Black insisted that an outside agency should be employed to prepare publicity literature.
c. It was agreed that publicity literature prepared in-house was not of a high standard.