阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式，

China is exploring space to learn more about the universe. In 2003, Yang Liwei 【小题1】 (successful) orbited Earth in the Shenzhou 5 spacecraft. As 【小题2】 result, China became the third country in the world 【小题3】 (send) humans into space. Then followed Shenzhou 6 and7, Jade Rabbit, Tiangong 2 and so on. All the 【小题4】 (achievement) show one step further into space exploration.