We informed you that we have kept our price close______ the costs of production.

If your products coincide ______our market, we will place a large order with you.

We refer you______our letter of March 15th.

You can track the whereabouts of the goods______the internet.

We very much regret to state that we can't______ you in this respect .

It's only in view of our long friendly business relations______ we extend you this accommodation.

Please do your most to establish the covering L/C______ we can arrange the shipment smoothly .

At present，we cannot______ entertaining your connter-offer as our price is quite realistic.

Everything______consideration，the price is reasonable .

Remittance and collection are two kinds of______ credit while L/C belongs to______ credit .