Mr. Fox fell ill, thus __________ it necessary for us to find another person for his job.
The children were playing games on the playground, ________ school uniforms.
It is written clearly in the requirements that all passengers ______ check onto board 30 minutes before the plane takes off.
—I failed again. I wish I _________ harder. —But you _________.
Drunk driving used to occur _______, but now it is under control.
It gives his life a flying start ______ he has gone abroad for further education.