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。

AIDS is caused by a virus called HIV. The immune system of those who have AIDS 【小题1】 (become) so weak as to lose the ability to fight mild sicknesses. The virus is spread 【小题2】 three ways — it can be passed on through unprotected sex, through blood and from a mother to 【小题3】 (she) child. But HIV cannot be spread by 【小题4】 (mere) touching someone with AIDS. We should acquire more knowledge about AIDS, which has ruined many people’s lives. In an African village lives a boy named Ajani 【小题5】 mother has just died of AIDS, the same disease that took his father. Fortunately, he did not get HIV from his mother who had access 【小题6】 Prescription AIDS medicines when she was pregnant. Ajani wants to be a doctor when he grows up. He believes that education as well as medical treatment is the key to 【小题7】 (stop) the disease in the future. AIDS is not just 【小题8】 African problem but a serious problem around the world, including China. Something must 【小题9】 (do) to stop the disease. Chinese government has opened labs to monitor the disease. 【小题10】 (nation) help has also been very important, such as the United Nations. Let’s work together to end AIDS.