Can you ride ______bike?—Yes. What about going to the park by bike this coming Saturday?

The chairman thought __________ necessary to invite Dr. Smith to speak at the meeting.

Liu Ying is my friend. She’s not as good _____ sports as her sister.[ ]

Please give my best wishes ______ your parents.[ ]

Where are the books?—_______ in the bookcase. Do you need _______ now?