—I have got a headache.—No wonder. You ________ in front of that computer too long.[ ]

Why was our foreign teacher unhappy yesterday— News about the tsunami striking her country ______ an attack of homesickness.

Our school proposes that students should involve themselves in community activities _____ they can gain experience for growth.

riding along the street and all of asudden, a car cut in and knocked me down—- You can never be _______ careful in the street

On weekends, I can’t relax _______.