concerned careful.
anxious nervous
enthusiastic halfhearted
devoted dedicated
stretch extend
distance reduce
draw shorten
reach out cut short
postpone
adjourn
slow down
defer
comply
heed
observe
obey
with
from
after
about
to have become
to have begun
to have been
to have had begun
among
between
in between
over
while his brother discusses the effects of pollution
while his brother discussed the effects of pollution
while his brother was discussing the effects of pollution
while his brother had discussed the effects of pollution
clear evidence
building material
a cement mixer
something to cover a path
exactly
usually
truly
literally