. It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.

Always remember put such dangerous things as knives out of children’s   

The island where these rare birdsnest has been declared a _____.

Sometimes you need to give a stain _____ before adding the garment to a load of laundry.

The environment is exactly everything that affect us in some_____.