下列语句是对学习中的苦与乐的描述,其中描述学习的乐事的语句是( )
-Shall we go skating or stay at home? -Which ________do yourself?
They are stamp collectors;they often ________stamps with each other.
-There is no need________,for the clock says we have about ten minutes to go. -Oh,don't be foolish. The clock on the wall is five minutes________.Don't you know?
-Could I have the small table by the window? -Sorry,sir. It ________ in advance.
With everyone's face ________behind the mask,it's hard to tell who they really are.