Pierre Curie ______ his own research workand joined Madam Curie in the search for radium

Where do you live, Jack—I live on the _____ floor. My room is No._______.

I myself don’t believe in ghosts; ________,I wouldn’t like to be alone in that room at night.[ ]

The conference was not,_____ many people had expected, so successful.

_____________ comes will be welcome to the open-air concert.