英语短文改错!(最好有解释）

英语短文改错!(最好有解释）
The spread of the desert is not new.In the ancient times,(1.)
for example,the Middle East was a very fertile area.In(2.)
hundreds of years,desert moved from place to place with their(3.)
animals when an area destroyed.This gave the land a chance(4.)
to recover.They also raised crops every the other year in an (5.)
area,so as they never overworked the land.These traditional(6.)
ways are disappearing,largely because modern technology.Yoday,(7.)
many factors add to the problem at the edges of the desert.The(8.)
population is growing up,and too many animals feed on the (9.)
fragile land.There is now a worldwide effort stop the spread(10.)
of the desert.This may be the last chane to save the land.