er to keep the balance of ecosystem, everypossible means _______to deal with the problems of the over-exploiting ofnatural resources.

You forgot to go to the meeting? You _____important things. It’s so disappointing.[ ]

The Smith are considering _________ to England because they __________ the cold weather there.

They ______ the train until it disappeared in the distance.

In America, when you’re given a present, you can open it ____. You don’t have to wait.