单项选择题
We would be most thankful if you could extend this favor to us and agree （） 50% by L/C and 50% by D/P at sight.
A.with B.upon C.at D.to
单项选择题 Our sewing machines （） fast, and there have been numerous enquiries about them.
单项选择题 Please note that our offer remains firm （） ten days for your acceptance.
单项选择题 We hole that you will find many items of （） to you.
