Professor Smith, along with his assistant, ________on the project day and night to meet the deadline.
I’m living in the apartment nearby.Come and see me whenever________.
___ the room,the nurse found the tape-recorder ___.
We can never forget the days _______the two astronauts in spaceship worked together and the days _______we spent together.
Who is________the fire in the kitchen?
Only when he told me________what trouble he was in.