

Тут нечему удивляться, это нормально.
There's nothing to be surprised about here, it's normal.
Я не удивляюсь, что он опять опоздал.
I'm not surprised that he was late again.
Все удивлялись, как быстро он выучил язык.
Everyone was amazed at how quickly he learned the language.
"удивляться" is in the lesson "Verbs 20" (Level 43), along with 10 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.