My friend Tom stays at Internet bars above 8 hours every day ______, really a netter(网虫).
In history, the Romany split into different groups and developed their own language, _______ there are now approximately sixty varieties.
Hurry up﹗The train ______. You know it ______ at 9:00 am.
Is this the first time you_______ Beijing?
His singing career began to ______ in the late 1990s.
Tsinghua University, ______ in 1911, is home to a great number of outstanding figures.