1. —Shall I close the window now before I leave?

— ________ , I'll check it myself later.

A. No problem.                   B. No hurry.                       C. Go ahead.                      D. Don't bother.

2. The little girl playing the piano at the party left us a deep ________.

A. tradition                         B. encouragement               C. impression                     D. improvement

3. To return to the problem of water pollution, I’d like you to look at a study ________ in 2012.

A. conducted                      B. conducting                     C. being conducted             D. was conducted