1. For about six months, he and his fellow staff have ____ at the new design.

A.devoted                   B. engaged                  C. took                              D. worked

2. We didn't plan our art exhibition like that but it ____ very well.

A.worked out                     B. tried out                 C. went on                  D. carried on

3. I would ____ against undue optimism.

A.caution                    B. cautious                  C. cautions                  D. caution to the winds