It rained last night and the flowers don’t require ____, so he ____ water the flowers.
His singing career began to ______ in the late 1990s.
Tsinghua University, ______ in 1911, is home to a great number of outstanding figures.
__________ you know, this is the day the quake happened
I hate ______ when the weather becomes freezing cold because there is no heater inside.
Rather than _______ on a crowded bus, he always prefers ______ a bike.