Помогите,плез,не понимаю 10. Today the world _____ so rapidly; things never stay the same. 1)changes 2)has changed 3)is

10. Today the world is changing so rapidly; things never stay the same. 11. When I first came to England in 1938, I thought I knew English fairly well. 12. Sara, my next door neighbour, has a car, but she doesn\'t use it very often. 13. It\'s raining, and I see you don\'t have an umbrella. You can borrow mine, I don\'t need it now. 14. Suddenly they heard a strange noise and looked at each other in horror. 15. What does this word mean?