David can speak idiomatic American English and yet, _____ English, he doesn't know it at all. 

We see the lightning ____ it happens, but we hear the thunder later.

Every evening after dinner, if not ______ in reading books, she can be found _____ on the sofa watching TV.

He doesn’t like to be interrupted if he_______ . 

— Obama won the election. It’s amazing!— Yes. But the result was within ______ we had expected, ______ brought great joy to many young people and the black.