yes
Communication has changed very much in the past 100 years.
it hasnt changed really
it is
yes it has changed a lot
causes of death have changed over the last 100 years due to many reasons, such as a more widespread recognition of illnesses
it hasn't
not at all
alot
they have dried up over the years
technoligy has got better and faster
Delhi was changed
they have got bigger and hotter