1. I'm sorry I kept you waiting so long.
很抱歉，讓您久等了。
還能這樣說：
I am sorry for keeping you wait so long time.
I am sorry that you await me for my being late.
諺語：
Time and tide wait for no man.
時不待人。

2. It's my great honor to have this chance to be here.
我很榮幸有機會在這里。
還能這樣說：
I am honored to be here.
I have the honor to be here.
諺語：
Every dog has his day.
是人皆有出頭日。

3. I hope I didn't rush you.
希望沒有給您造成不便。
還能這樣說：
I wish I didn't trouble you.
I hope I didn't make some trouble for you.
應用解析：
rush on/for 大量急需；
rush sb. into sth./doing sth. 使某人倉促行事

4. I wanted to ask you a few questions face to face.
我想當面問你幾個問題。
還能這樣說：
I wanted to ask some questions to you in your presence.
I'd like to ask you a few questions face to face.
諺語：
A good face is a letter of recommendation.
漂亮的面孔就是最好的介紹信。