The girl began to sing __________ the piano.
The other day, my father drove his car down at ____ I thought was a dangerous speed.
____ is known to us all is that the old worker, for _____ life was hard in the past, still works hard in his seventies.
----Would you permit me ____ here?---- Sorry, we don’t permit ____ in the library according to the rules.
Would you please keep silent? The weather report ________ and I want to listen.
The boy ____ on the ground ____ to me that he ____ the book on the table.