Who visited? Why did his friend visit? With whom his friend visited? Did his friend visit?
Вопросы составлены некорректно, так что я не совсем понимаю, что имеешь ввиду
2) Mathematics, astronomy
7) technology can help to make our lives easier
8) internet
<span>9) biology is very important, cause the knowledge that we get can help to protect us from unknown diseases</span>
<span>girls had an another meeting the next day</span>
Ties-связи
Если будут вопросы обращайся всегда рада буду помочь!!:))