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b.Is life getting more expensive ? - Yes?, it is.
c. Are we using more energy? - Yes,we are.
d. Are people going to more univercity? -Yes, they are.
e. Is the population getting older? - Yes? it is.
f. Are people getting married fewer? - Yes? they are.
g. Are we living longer? -Yes? we are.

b. increase
c. is cause
d. is melting
e. are rising
f. is changing
g. having
h. getting