Exercises 4:
1.Be sure to follow the instructions given at the top of the page.
2.Students arriving late will not be permitted to enter the classroom.
3.The people waiting for the bus in the rain are getting wet.
4.We drove along the road flooded after the heavy rain.
5.The scientists reseaching the causes of cancer are making progress.
6.The wild ox kept at Nam Cat Tien National Part is of a special kind.
7.The helicopter flying toward the lake made a low droning sound.
