III.) Complete the sentences using have/has/had/will have to.
1) Every biologist___accept evolution, nothing in biology makes sense without it.
2.) British ecologist___struggle for decades to obtain support for their research.
3.) Everyone___protect the nature with special care and interest.
4.) Darwin__prove his theory and he spent years gathering abundant and convincing
5.) What obstacles___Charles Darwin_overcome?
6.) What problems___we___face in the future?
7.) To survive all humans___care about nature?
8.) Teams of ecologists ___help the groups of plants and animals move if their habitats move due to climate change.