Professor Smith, along with his assistants,______ on the project day and night to meet the deadline.

 Mom used only half of the money, the rest of which ______ saved for other purposes.

I wonder whether the teacher is one of those who _______ to the mountain village to help the children there.

There ______ a football game tomorrow evening, and I must stay at home to watch it.

We can see only one of the doors ______.