This pdf file has four pages of drawing exercises.
Practice Drawing Lines 1 focuses on drawing straight lines (without a ruler!)
Practice Drawing Lines 2 focuses on drawing curved lines.
Practice Drawing Lines 3 focuses on replicating shapes and lines within a box.
Practice Drawing Reflections focuses on trying to mirror the shapes looking at proportions, angles, etc.
While these sheets are good for a variety of grade levels, They are not as easy as they first looks! Drawing straight lines without a ruler is a skill a lot of students struggle with. Some students have a lot of difficulty drawing lines that are smooth and drawn in one pass. I used these sheets with my grade 9 students, and many found it challenging, but were happy when they improved through practice on the sheets!