Studies show that people are more_____ to suffer from back problems if they always sit before computer screens for long hours.

Modem equipment and no smoking are two of the things I like _____ working here[ ]

Ifeel that one of my main duties ______ a teacher is to help the students to become better learners[ ]

Her sister is a nurse, so she always wears __________uniform when she works.

Somebody _____ the sofa.—Well, it wasn’tme. I didn’t do it.