What might the world look like in 50 years? Here's what might happen.
1. The world population will be over 9 billion. Diseases will be more common, as everybody will be physically closer to everyone else, and there will be usually lack of food.
2. We'll also have to start cutting down on our energy use: If humankind continues to use energy at the rate it does now, and population keeps growing, we will need other three earths to support ourselves by 2050.
3. The Earth's temperature will keep increasing, the Dead Sea will be almost completely. dried up, nearly half of the Amazon rainforest will be deforested, wildfires will spread and the polar ice caps will be only 60 percent the size they are now.
4. The majority of people will live in cities, which will have more trees and plants. It'll be compulsory for skyscrapers to have parks and sky gardens, for example, and buildings will be covered in trees which help to clean our air by reducing CO2.
5. Shower heads will automatically adjust their height, water flow and temperature depending on who's using them.

50. Hurry up, or you will be late for school.
A. You should hurry up to be late for school.
B. If you don't hurry up, you will be late for school.
C. Hurry up, so you will be late for school.
D. Hurry up, but you will be late for school.

49. Although it was stormy, I went to the library to borrow some books.
A. I went to the library to borrow some books because it was stormy.
B. I went to the library to borrow some books, so it was stormy.
C. I went to the library to borrow some books about storms.
D. Despite the stormy weather, I went to the library to borrow some books.