請幫忙查看一下英文書信

We will send you the color swatches through Fedex for your approval. Please let us know your first choice and second choice when you received it.
Thank you for your _________________We will send it to the following address.

This is a wonderful english letter i could not find any mistake but i only added a sentence which make the letter awesome.

We-----------------------when you received it. And your early reply in this matter will be deeply appreciated.