So absorbed ________ in the research that she didn’t hear someone knocking at the door.

What do you think of Children’s Park—I think it’s a good place __________.

A great number of students by the interviewer said that they were forced to practice the piano.

I don’t like this pen. Could you show me —Ok. Here you are.

alking about doing exercise, you should choose an activity that you enjoy and _____ that you will stick with.