When we went into the park, we saw someone _____ Chinese Kungfu.
— have you learnt English? —Since 2006.
I think skiing is ____ great fun.
-I have bought a Chinese – English dictionary? -When and where_____ you _____ it?
He has been in the USA .
-Excuse me, does Mr Smith son live here? -He used to_______ here, but he gets used to ______ in a modern city.