(inglês)
4. Complete the sentences with the correct word:

4.1) Global warming threatens the existence of polar bears. They are now
extinction.
a) changing
b) disastrous
c) threatened d) evident
to melt.

4.2) Ice needs
a) cold
b) heat
c) fossil fuels
d) survival
of wildlife habitat possibly

4.3) The Arctic's animals are losing their habitat. The
results in extinction.
a) loss
b) burning
c) danger
d) weather
try to solve them.

4.4) Some of those problems are hard to solve, but we should
a) at last
b) at least
c) forever
d) actually​