Swimming is _______ fun in _______ summer.
--- When did you meet your English teacher? --- While I _________ a bike along Jiaomen River.
---How did you go to Guangzhou yesterday? --- I took a taxi _________ I would be in time for the meeting.
Guangzhou subway Line 4 helps us to go to Tianhe ________ than before.
Every night I read books for _________ hour before going to ________ bed.
---Who cleaned the blackboard yesterday, Dick? ---John _________.