Mosquitoes breed in stagnant water in areas with a summer temperature of over 21 °C. The female anopheles mosquito, one of 60 species of mosquito, can      31      a samll parasite. If the mosquito      32      a person who has malaria, it picks up the parasite as it      33      the human blood. The parasite      34      inside the mosquito and is      35      to another human when the mosquito bites again. Malaria      36      fever and shivering fits. It is not      37      a killer in itself, but it weakens the      38      people so that they cannot work very hard. They gradually become      39      and more likely to      40      to other diseases.