Complete the text. Write the letters in the correct order. Try an experiment! • Put your fingers on your ¹ ________ wrist (twisr) and feel the ² ________ (ystade) ³ ________ (etab). • Count your ⁴ ________ (eslup) rate. Write it down. • Run for one minute. • Notice how you ⁵ ________ (erbthea). Are you breathing fast or slowly? • Count your pulse rate again. Is it higher or lower? When you do exercise, your body needs more ⁶ ________ (gyoxne). Your lungs and your ⁷ ________ (etrah) have to work harder.