1. what was the girl doing when she was hit by the car?
2. The teacher spent a whole weekend grading the children's paper.
3. Miss Lin came to the library to collect information for her paper.
4. He is always ready to help his classmates review lessons.
5. Boys are more fond of playing football than girls.
6. A lot of companies are suffering from shortage of skilled workers.
7. The bomb went off in the crowded street.