It was not until 1920 ______ regular radio broadcasts began.
---How do you like the Art Festival? ---Fantastic. It must be the most important and fascinating_________ in the year
In the mobile message, Sarah told me that last night was the first time she_________ a film in the year.
It is almost three months __________ we became a senior student of Bashu Secondary School.
A great hall has _________ in order to ease the problem of dining congestion(拥堵) in our school.
A best friend is _________ who knows all about you and still loves you.