How to stop current audio before another audio starts?

I have a game object with audio on it on click however when the scene opens there is audio already playing. If you click the game object to fast the other audio starts playing and there is an overlap. I've tried numerous solutions to no prevail. Does anyone have a suggestion? Here is my current code.

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.SceneManagement; using UnityEngine.Audio;

//var rock : GameObject; [RequireComponent(typeof(AudioSource))]

public class TrexMouthController : MonoBehaviour {

 public GameObject feed;
 public GameObject weight;
 public GameObject height;
 public GameObject hold;
 public GameObject length;

 public AudioClip mymouthclip;

 public AudioClip[] audioSourcesToIgnore;

 AudioSource audio;

 // Use this for initialization
 void Start () {
     
         audio = GetComponent<AudioSource> ();

 }
 
 // Update is called once per frame
 void Update () {
     
 }



 // Event Trigger Handlers
 public void CubeClicked()
 {
     

     Debug.Log ("MouthClicked");
     feed.SetActive (true);
     weight.SetActive (false);
     length.SetActive (false);
     height.SetActive (false);
     hold.SetActive (false);


         audio.PlayOneShot (mymouthclip, 0.7F);

 }

}