Don't say "okay" say... INSHAH'ALLAH.
Don't say "wow" say... SUBHAN'ALLAH.
Don't say "great" say... MASHA'ALLAH.
Don't say "thanks" say... JAZAK'ALLAH KHAIR.
Don' say "take care, bye say... FIE AMAN ALLAH.
Don't say "hello" say... ASSALAMU ALAIKUM WA RAH'MATULLAHI WA BARAKALTUM.
also dont clap in a mosque like the kids were doing yesturday at the quran compatition the teacher told them 5 times to say takbir and once she would say takbeer instead of allahu akbar they would clap people should teach their children the proper way of giving recognition