Now human beings _____________(to kill) our planet.
People usually_______________(not to care) about the environment.
The builders have ___________________(to cut down) a lot of trees in the forest.
As a result many animals were to ______________(to die out).
When did the destruction of this countryside _____________(to start)?
_____he ____________(to plant) a tree at that time yesterday?
_____he _____________(to plant) down the tree by 6 o’clock yesterday?
According to the forecast a disaster _________(to happen) soon.