名词解释：offer
An offer is a proposal addressed to specific persons indicating an intention by the offeror to be bound to the sale or purchase of particular goods for a price..
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This is our best price, ____ which we have concluded many orders with other buyers in your city.( )
I would love ________ to the party last night but I had to work extra hours to finish a report.
My aunt, whose absence was _____ for three weeks, was heartily welcome to remain away, for we were much merrier and more comfortable without her.
In the middle of these otherwise _____ plains is a striking range of mountains.
We have received your letter of September 12, ______ we are glad to know that you are interested in our electric heaters.
