If you meet trouble, you can ______ your friends ________ help.
Before the new year, _________ people went to visit the flower market.
--- 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.