下列事项中最可能引起注册会计师对持续经营能力产生疑虑的是（）。A.投资活动产生的现金

请仔细阅读Mr. Smith对Sam说的话，从A、B、C、D中找出可以替换1—4小题中划线部分的选项, 并完成第5小题。

A. be more patient         B. be yourself C. understand             D. no chance

小题1:“Sam, you’re usually so outgoing and friendly. Don’t be afraid to show your true colors.”
小题2:“If you get the picture. Please do it again.” Mr. Smith.
小题3:“Keep your shirt on and don’t be nervous. They’ll be here before the class starts.”
小题4:“Sam, don’t be so confident. We will have a fat chance to pass the test.”
小题5:What’s the relationship between Mr. Smith and Sam?

A．Father and son.	B．Doctor and patient.
C．Teacher and student.	D．Driver and passenger.