________volcanoes now for many years, I am still as enthusiastic about my job as the first day I first______.

—Who is the man ______ by a group of students there?—A professor _____ research on physics.

．________ bricks，workers press clay into blocks and bake them to the requisite hardness in a kiln.

China’s hurdler Liu Xiang was disqualified due to false start in the 60-metre event, ______ his rival Dayron Robles of Cuba an easy win of 7.66 seconds.

 After a knock at the door, the child heard his mother’s voice ______ him.