Сначала уберем ошибки в тексте, ок?
I study in the seventh form. My (favourite) teacher's name is Natalie. My favorite lesson is physical education. I play tennis. In July we go to the sea. I love swimming. Yesterday, I cycled for two hours. My hobby is computer games. My favourite computer games are GTA Five, Watch Dogs 2 and Hitman. I have got three sisters and a brother.
I've got a friend. His name is Nick. He is fourteen years old. Nick is tall and slender. He's got blue eyes and fair hair. Nick is a good friend, he's kind and easy-going, but sometimes he can be stubborn. He studies in the eighth form. He studies well.
Nick's family lives in a three-room flat on the second floor of a ten-storied block of flats. There are four people in his family: a mother, a father, Nick and his sister. Nick's got two pets, they are cats.
Nick's hobbies are playing football, roller skating and playing computer games.
1. TV stations have to transmit a total of 1,500 hours a day. - Телестанции должны вести трансляции в общей сложности 1500 часов в день.
2. Space television has a great future. - У спутникового телевидения большое будущее.
3. The scientist has begun working at the problem. - Ученый начал работать над проблемой.
4. She had breakfast before she left home. - Она позавтракала, прежде чем уйти из дома.
5. Many difficulties have been overcome by researchers. - Многие трудности были преодолены исследователями. (хотя здесь лучше залог поменять )