Most environmental problems exist because adequate measures for preventing them ____in the past.
No matter how frequently on stage, the tickets of the drama are still so hot that you have to book one two or three months in advance.
--- There is a story here in the paper about a 110-year-old man. --- My goodness! I can’t imagine that old.
The Beijing Opera Taking Tiger Mountain by Strategy is still_____ in many places and it is well received.
The performance was a great success because the orchestra was by an internationally famous conductor.
,Anna did not feel happy at all.