_______ is known to everybody that the moon travels round the earth once every month.
Only when he reached the house ___ it was the same place he’d been in last year.
Never before ___ seen anything who can play tennis as well as Robert.
Only after Mary read her composition the second time ___ the spelling mistakes.
The headmaster will not permit the change in the course, nor ___ it a thought.
In no city of China ___ little about the economic development.