Question

ayuda por favor...... ​

Answer 1

Respuesta:

3.

b) Hopefully endangered animals will be saved by conservation activists.

c) A lot of smog has been produced by cars since their invention.

d) By the year 2000, pesticides had been used for decades.

4.

b) Waste material will be reduced by recycling.

c) The Earth had been inhabited by the dinosaurs for ages by the time a big meteorite hit it.

d) Our planet will be helped by conservation activists.