单项选择题
A. that you have observed C. how that you have observed B. that how you have observed D. how what you have observed
A. Martin will have completed his swimming. B. Martin will swim back home. C. Martin will celebrate with his family. D. Martin will swim to the city of Belem.
A. The world will need 60% more food. B. The world will need 60% more fresh water. C. The world’s population will increase 17%. D. Fresh water will be in short supply in many countries.