The apartment is far from perfect, but it's (a)   we can still stay here after changing it to suit us.

It's the next challenge for us to be active in creating (a)   cities, in which our next generations can live for many centuries.

Water constitutes cost-free energy for (a)   electricity that is renewable and sustainable.

Next week we will study global warming's (a)   on the agriculture: how it changes the way farmers grow crops and raise livestock.

Don’t buy that product! Its packaging is plastic, which is not ….

(a)  

The decrease in petrol prices this week has had major influences on people using motor ...

(a)  

I wonder what the life in 2050 would be (a)   Will robots replace humans in the factories? Will people travel by flying cars?

We are polluting the air we ...

(a)  

If you are not ... with this topic, we can find another for our project next week.

(a)