I regret（）that I'm unable to help you.

1、I am still unable to make myself______

I am still unable to make myself______________in the discussion, which worries me a lot.Ato be understoodBunderstandingCunderstoodDunderstand

2、Can I help you?（）

Can I help you?（）AOK, I'll take itBThat's goodCYes, I'd like a sweaterDIt's too dear

3、Good afternoon. Can I help you?（）

Good afternoon. Can I help you?（）ANo. I don't think so.BThank you.CI need to buy a birthday present for my son.DYes. I think so

4、一I’m sorry．That wasn’t of much help．一O

一I’m sorry．That wasn’t of much help．一Oh，_______．As a matter of fact，it was most helpful．Asure it wasBit doesn’t matterCof course notDthanks anyway

5、I'm very sorry to have（） you with so m

Im very sorry to have（） you with so many questions on such an occasion.AinterferedBoffendedCimpressedDbothered

6、Can I help you, sir?（）

Can I help you, sir?（）ANo, I don't need your help.BYes. I'd like to withdraw some moneyCWell, leave me alone.DDon't bother me!