Don’t fight in class __________don’t run in the hallways．

A．or            B．so          C．but         D．and

Susan is good-looking，__________she’s a little hit short．

A．so          B．with          C．or          D．but

Jane, please turn off the lights ______ you leave the classroom.

A．after              B．before                    C．until                   D．but

--Hurry up! The bus is coming．

--Wait a minute．Don't cross the street ________ the traffic lights are green．

A．until               B．after              C．while              D．since

--Would you like to go out for a walk with me?

--Not__ I finish my dinner．

A．as              B．when                C．after               D．until