Are you studying English today? If you are, then we have a good idiom for you to use.
" no wonder "
This means I am not surprised.
A. I can not find my pen.
B. No wonder. Your desk is so messy!
A. I did not do well on the TOEIC test.
B. Well, no wonder. You didn't study at all.
A. My car broke down.
B. No wonder . It's 20 years old!