【正确答案】
Dear Jack,
We are going to have a few friends to dinner on Saturday, the 25th of this month at 7 o'clock. We should be very much pleased if you and your good lady would dine with us. It will be a small party, as we have only asked Mr. and Mrs. Gao, and Mr. and Mrs. Liang, all close friends of ours. We think we will have a lot to chat with each other about the work and life we have experienced for the several months.
We shall be very much delighted if you will give us your company. Hope to meet you on the day.
yours cordially,
Martin