Use the collocations in 57.1 to rewrite the underlined parts of the sentences.

1. Asia underwent (a dramatic increase in the population) in the latter part of the 20th century.
2. The crop had been subject to (having its genes altered) .
3. Since the advent of the internet, the world has become (one single community) .
4. (Times when the traffic cannot move) can cost the economy millions of pounds.
5. Scientists now understand (how the human genes are composed) .