Read the text below. For questions choose the correct answer (A, B, C or D). Write your answers on the separate answer sheet.

The Smartest Rat in the World

Hobbie-J is no ordinary rat. In fact, thanks to the modification of a single gene, he’s probably __________ intelligent rat in the world. The rodent, named after a Chinese cartoon character, __________ as an embryo with genetic material. As a result, Hobbie-J can remember objects for three times as long as his contemporaries, and is far __________ than other rats at negotiating mazes. Since the technique __________ previously to work on mice, the researchers are optimistic that it could be successfully applied to a wide variety of other species – possibly __________ humans.