He made _____ known to his friends that he didn’t want to enter politics.
After that, he knew he could __________ any emergency by doing what he could to the best of his ability.
Never before __________ seen anybody who can play tennis as well as Robert.
Only with the greatest of luck __________ to escape from the rising flood waters.
The headmaster will not permit the change in the course, nor __________ it a thought.
(2012·辽宁) Not until he retired from teaching three years ago __________ having a holiday abroad.