Giúp mk giải bài này với. Mk cảm ơn.

Everyone (1) knows that humans have been flying for a few hundred years. but(2) is it possible that ancient civilazations also had the ability and technology to fly?

In southern peru, there're hundreds of lines which  ancient culture drew in the dust. on the ground they just(3) look like straight lines. but when you (4) see  from the air, you (5)seem exactly what they're. They're incredible and enormous pictures . The pictures (6)include animals, birds and symbols.

One bizarre theory, which most mainstream scientists (7)disagree with, is that the people who made the lines thousands and thousands of years ago flew above the lines in balloons. It (8) be incredible, but a few people (9)understand believe it's possible.