_________ we have realized the danger of over-consumption, some measures should be adopted as soon as possible

I am trying to do what is best, but ______ I’ve got to consider the cost, which is of great importance.

We must______ using plastic bags in order to protect our earth.. — Yes, we mustn’t _________any more.

Jerry Lucas, _______ NBA star, used to be _______ university student.

I had not been reading for half an hour_____ I heard the steps outside