1 The Mongolian nomads offer their hospitality very generously. (это предложение - характеристика, поэтому Present Simple)
2 Why are you taking a photo of that tree? (действие происходит в данный момент => Present Continuous) What’s so special about it?
3 The last flight to Morocco leaves at 7:30 pm. (расписание)
4 Channel 10 is showing a series of documentaries on Ellis Island this week. (речь только об одной неделе)
5 According to statistics, the number of homeless around the world is growing more and more every day. (описание происходящего изменения)
6 Benson shoots the ball and scores three points for his team. (при комментировании спортивных событий используется Present Simple)
7 Professor Thomson is giving a lecture on African tribal rituals this afternoon. (действие, запланированное на ближайшее будущее)
8 Petra books an aisle seat whenever she travels by plane. (привычка человека)