The Red List has been introduced to raise people's awareness _______ conservation needs.
of
When a species is no longer found on earth it is said to be (threatened / endangered / extinct / at risk).
extinct
Many species are threatened in the wild due to habitat (construction / destruction) by man.
destruction
We (mustn't / don't have to) forget our passport when we travel abroad.
mustn't
The air in the country is not as pure as it (might be / used to be / would be / must be).
used to be
As I won't be at home tonight, I (have to do / might do / can do / would do) my homework during my lunch break.
have to do
There are a lot of tickets left, so you (mustn't / can't / needn't / mightn't) pays for the tickets in advance.
needn't
Plants and animals are responsible (for / to / at / on) a variety of useful medications.
for