Question

complete the sentences with the discourse markers, as adequate:
 
                            and - but - by - from - like - when - where

a. carbon dioxide is produced_______________ we burn gasoline in our cars
b. pollution is created__________human beings
c. the pollution that causing global warming comes__________human activity
d. those are different names, ____________ they mean the same thing
e. we cut down forests ___________ destroy coral reefs
f. we spoil and waste precious resources __________ the topsoil

Answer 1

a) when
b) by
c) from
d) but
e) and
f) by