— I heard they went skiing in the mountains last winter.— It ________ true because there was little snow there.
.Lessons _______ easily were soon forgotten.
The ground is _______ with _______ leaves.
The library's study room is full of students _______ for the exam.
The scientists were waiting to see the problem _______.
The foreigner tried his best, but he still couldn't make his point _______ .