1. I'm sorry I kept you waiting so long.
很抱歉，让您久等了。
还能这样说：
I am sorry for keeping you wait so long time.
I am sorry that you await me for my being late.
谚语：
Time and tide wait for no man.
时不待人。

2. It's my great honor to have this chance to be here.
我很荣幸有机会在这里。
还能这样说：
I am honored to be here.
I have the honor to be here.
谚语：
Every dog has his day.
是人皆有出头日。

3. I hope I didn't rush you.
希望没有给您造成不便。
还能这样说：
I wish I didn't trouble you.
I hope I didn't make some trouble for you.
应用解析：
rush on/for 大量急需；
rush sb. into sth./doing sth. 使某人仓促行事

4. I wanted to ask you a few questions face to face.
我想当面问你几个问题。
还能这样说：
I wanted to ask some questions to you in your presence.
I'd like to ask you a few questions face to face.
谚语：
A good face is a letter of recommendation.
漂亮的面孔就是最好的介绍信。