—It's 10 o'clock now. I must go.

—It's raining heavily outside. Don't leave ______ it stops. [ ]

A. since

B. until

C. when

D. because

代理人在代理活动中应注意下列问题（）。

A.应在代理权限范围内进行代理活动

B.应亲自进行代理活动

C.应认真履行职责

D.应严格按被代理人的指示活动

E.不得滥用代理权