Tony is ______ than his father, though he is only eleven years old.
Some students are so ______ that they often make mistakes in their homework.
__ we are young, we can still do something to help protect the environment.
--- Jimmy, don’t put this pair of trousers on the sofa.--- Sorry, mum. I will _____________ right now.
---You were out when I went to your house this morning.---Oh, I _______ for a friend from England at the airport.
_____Hepburn’s acting years, she insisted _______ working closely with UNICEF.