I don’t know if you noticed their absence or not, but we ________.
Many people believe the English _______ on TV and the radio is standard English.
It was because of the bad weather __________ the football match had to be put off.(推迟)
It is the first time that I _______ this kind of moon cake.
There was ______ time _____ Chinese used foreign oil.
While ___ along the street, I met an old friend of mine.