We (offer, quote) for 500 sets of Bicycles (at, on) $50 (on, at, of) CIF Lagos basis. 2. There is (not, no) possibility (of doing, to do) business at this price. 3. We write you today (with, in) the hope of entering into (business, business relations, business relation) with you. 4. We shall (try, make) our best to (meet, set) your (requirement, acquirement). 5. We are sure that we will (be able, can, in a position ) (by, through) joint (effort, efforts) to promote both friendship (as well as, and) business.