Has your brother ever been to the Sand Lake?––Yes, he has _______ the Sand Lake manytimes.

are you always staying up so late these days—To prepare for my final exam.

It was commanded that the coal mine survivors ____ to the nearest hospital for treatment.

He was knocked down by a car ____ he saw it run toward him.

Do you think teenagers should be allowed to make their own ________________—No, I don’t agree with this.