----What a nice bike! How long ____ you ____it? ----- Just two weeks.

Many teachers______cars nowadays. They drive to work every day. 

Look! The police ______ the food onto the bank of the river.

— A computer is very popular and helpful .— I think so. It _______ in many different fields.

--When did you become a volunteer for the elderly?-- Two years ago. I ______ this group since then.