Studies show that students are more ______ to be addicted to playing computer games if they always play them before computer screens every day. [ ]

He has got himself into a dangerous situation ______ he is likely to lose control over the plan.

There seemed no end to their troubles; nowhere _________ upon a path.

What ________ the number of the students in your school —-About two thousand. A number of them ________ from England.

This new kind of chemicals will help keep the air, soil and water________ from pollution.