It is the _________ in Britain that young people often do not shake hands when they meet someone for the first time.

Mr. Li is gaining _______. He has to do some exercises to lose _______. 

—What’s the central idea of the passage，Bob?—Sorry，I can’t make________of it.It’s beyond my ability.

–How can I operate this machine?—Well, just refer to the _______.

She expressed ________to the teachers for helping her pass the College Entrance Examination.