如图∠1=30°，∠2=____ ．

The second runway of Hong Kong International Airport was officially ____ on May 26,1990.

China officially set Sept 3 as "Victory Day" to mark China's victory over Japan in World War II. The establishment of "Victory Day" highlights Beijing's ________ to peaceful development and the importance of ________ the past.

按要求完成如图所示实物图的连接要求：灯L₁、L₂并联，电流表测灯L₁中的电流．

图为鸟卵结构示意图,请根据图完成下列问题。