diff --git a/tts.py b/tts.py
index 9be9262..2eecbe1 100644
--- a/tts.py
+++ b/tts.py
@@ -40,13 +40,32 @@ def main():
 
     # Convert to sentences
     for line in lines:
+        # abbreviations (in alphabetical order)
+        line = line.replace("%",    "per cent")
+        line = line.replace("5G",   "5 G")
+        line = line.replace("CO2",  "C O 2")
+        line = line.replace("EUR",  "Euro")
+        line = line.replace("II",   "2")
+        line = line.replace("IBM",  "I B M")
+        line = line.replace("IMF",  "I M F")
+        line = line.replace("OECD", "O E C D")
+        line = line.replace("UN",   "U N")
+        line = line.replace("USB",  "U S B")
+        line = line.replace("WHO",  "W H O")
+        line = line.replace("WTO",  "W T O")
+        # compound words
+        line = line.replace("biotechnology",    "bio technology")
+        line = line.replace("Coronavirus",      "Corona virus")
+        line = line.replace("immunocompetence", "immuno competence")
+        # punctuation marks
         line = line.replace("-", " - ")
         line = line.replace("/", ", ")
         line = line.replace("—", ". ")
         line = line.replace(":", ". ")
         line = line.replace(";", ". ")
+        line = line.replace("?", "?.  ")
         line = line.replace("(", ". ")
-        line = line.replace(")", ". ")
+        # line = line.replace(")", ". ") # TODO: Check immune system article
         for x in line.split(". "):
             sentences.append(x.strip())
             sentences.append("<PAUSE>")