A．His roommate’ stays awake all night.
B．He want to play his recorder at night.
C．The present one is too expensive.
D．The present one is too expensive.

A．When he saw a lot of people come to the exhibition.
B．When he found one of his son’s paintings had been hung up by mistake.
C．When he was told one picture especially attracted attention
D．When Green told him that everything had gone off very well.