．（山东卷28）. The school rules state that no child shall be allowed out of the school during the day, ______ accompanied by an adult.

  A. once           B. when         C. if             D. unless

(09山东卷) 32. ------shall we have our picnic tomorrow?

-----______it doesn’t rain. 

A. Until        B. While        C. Once        D. If 

(2013·高考山东卷)________ at the cafeteria before，Tina didn’t want to eat there again.

A．Having eaten?? B．To eat

C．Eat?? D．Eating

.(江苏卷28). The retired man donated most of his savings to the school damaged by the earthquake in Yushu,

________ the students to return to their classrooms.

A. enabling         B. having enabled    C. to enable       D. to have enabled

(09山东卷) 32. ------shall we have our picnic tomorrow?
-----______it doesn’t rain.