1. The teacher couldn’t make himself          attention to because the students were so noisy.

A. to pay                   B. to be paid               C. paid                        D. pay

2. Finding the little boy        to the danger, the mother rushed to take him away.

A. exposed                                                     B. exposing

C. to expose                                                    D. having exposed

3. Knowing their son failed in the exam, the parents stood there,         .

A. looked disappointed                                    B. looking disappointed

C. looking disappointing                                  D. looked disappointing