行政相对人对行政机关委托的组织所作的具体行政行为不服的，被申请复议的主体是( )。

设集合A={1，3}，集合B={1，2，4，5}，则集合A∪B=______．

用括号内所给词的适当形式填空

1.Thirteen minutes ago,the train_____(leave).

2.The British and the Russians wanted_____( build)the railroad.

3.Would you like_____ ( come) to my party?

4.A lot of_____( foreign) visited our school yesterday.

5.People on Earth_____( watch) Yang Liwei's space flight on TV.

6.The plane landed_____ ( safe) at the airport.

7.Betty_____ ( wave) to his mother and ran to her quickly.

8.Winter_____ (last) from December to February in China.

9.There_____ ( be) no one in the room a moment ago.

10.I listened but_____ ( hear) nothing.

从4名男生和3名女生中选出4人参加某个座谈会，若这4人中必须既有男生又有女生的概率为______．

活性防活性印花，地色是K型活性染料，防染染料是X型活性染料。

学习障碍儿童没有智力问题。