如图所示，若只需L1发光，则用导线连接_1接线柱，若连接B、C接线柱，则L1、L2_2联；若使灯L1、L2并联，则接线柱A与_3连接，接线柱C与_4连接．

题干

如图所示，若只需L₁发光，则用导线连接____接线柱，若连接B、C接线柱，则L₁、L₂____联；若使灯L₁、L₂并联，则接线柱A与____连接，接线柱C与____连接．

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C和D,串,B,D

Volunteers Wanted
Organization	What volunteers call do	Time
Xinghua Primary	Sing songs to the students	On____
School	Help students____after school	On Mondays and Wednesdays
Sunshine Middle	Help read the newspaper or ____for the old people	On Sundays
School	Give out food and drink	On____
If you are interested in any of the jobs，you can call____．