An American scientist has won the Nobel Prize for Physics.

Our task had been completed before sunset.

A. We completed our task before sunset.

B. We have completed our task before sunset.

C. We complete our task before sunset.

D. We had completed our task before sunset.

The boy laughed at the beggar.

A. The beggar was laughed by the boy.

B. The beggar was being laughed by the boy.

C. The beggar was being laughed at by the boy.

D. The beggar was laughed at by the boy.

The boys were playing Cricket.

A. Cricket had been played by the boys.

B. Cricket has been played by the boys.

C. Cricket was played by the boys.

D. Cricket was being played by the boys.

They drew a circle in the morning.

A. A circle was being drawn by them in the morning.

B. A circle was drawn by them in the morning.

C. In the morning a circle have been drawn by them.

D. A circle has been drawing since morning.