_____is known to us all is that we should do as much as we can ______ stop the pollution of the environment.
The music ______ she is dancing sounds beautiful.
______ time ______, what the scientist said finally proved to be true.
Mary never does any reading in the evening, __________.
— Where is the panda?— It __________ by the doctor now.
I bought a vase of the Ming dynasty at such a low price at the Sunday market. It was really a nice __________.