B:It _____ from the_____, A:And where does the____,come from the______, B;It comes from the________
A:Where does the vapour come from?
B:It comes from the ____in the river,
A:_____can the water ____vapour?
B:The sun ____and the water______vapour.
A:Thank you ____ _____.Bye!
B:______.