Added an exercise to write in blank spaces

src/demo/listening.json

@@ -59,6 +59,33 @@
           ]
         }
       ]
+    },
+    {
+      "type": "writeBlanks",
+      "prompt": "Complete the notes below by writing NO MORE THAN THREE WORDS in the spaces provided.",
+      "maxWords": 3,
+      "text": "The Government plans to give ${{14}} to assist the farmers. This money was to be spent on improving Sydney’s {{15}} but has now been re-allocated. Australia has experienced its worst drought in over fifty years. Farmers say that the money will not help them because it is {{16}}.",
+      "solutions": [
+        {
+          "id": "14",
+          "solution": [
+            "250 million"
+          ]
+        },
+        {
+          "id": "15",
+          "solution": [
+            "roads",
+            "road system"
+          ]
+        },
+        {
+          "id": "16",
+          "solution": [
+            "too late"
+          ]
+        }
+      ]
     }
   ]
 }