n. a work of writing produced on sheets of paper that are held together in a protective cover
I borrowed a book from the library yesterday.

n. a room in a school where students take lessons
The students are studying English in the classroom.

n. a straight strip of wood, plastic, or metal, marked with units of length and used for measuring or for drawing straight lines
I can draw lines with a ruler.

n. a chart that shows all the days of the month.
Please mark all of these dates on your calendar.

n. a table, usually for writing on
Students study at their desks.

n. two small pieces of specially made glass worn in front of the eyes
Meg started wearing glasses when she was 8 years old.