Occasions are quite rare ______ I have the time to spend a day with my kids.
I know Mr. Shuili; we ______ to each other at an English lecture.
Little ______ that we were watching his every move,so he seemed to be going his own way in this business.
The report was not concrete and in a way lacked persuasion, but _____,I felt it is fair.
Scientists say it will be five or six years _____ it is possible to test this medicine on human patients.
You very fast if you went from New York to Boston in six hours.