Click "Next" two times to see the matching word and definition. Click "Delete" when you can remember them. When you think you know these words, go to Exercise 1.
border (n)
the line between two countries (or provinces)
highest (adj)
above all others
longest (adj)
longer than all others
population (n)
the number of people who live in a place
flow (v)
to move without stopping, (such as water in a river)