1.
one two three four five
pen pens
2.
one two three four five
pencil case pencil cases
3.
one two three four five
marker markers
4.
one two three four five
pencil pencils
5.
one two three four five
blackboard blackboards
1. two pens2. three pencil cases3. four markers4. five pencils5. one blackboard
图“略”