All their hard work has !The project is finished at last.

It usually ____ him fifteen minutes to walk to school.

It is _______ of the students to stay up readingtill late night before the final exam

Jane is______ researching into the life of wildlife and can’t spare time to care for his wife and children.

What _____heavy rain it was！—Yes, but I love______ air after it rains. It smells so fresh.