The open university was started in order to help those who _____ having a university education when they were young.
The day breaks, _______ the birds are singing.
________, I attended the meeting instead of him last week.
When you read the book, you’d better make a mark ______ you have questions.
I didn’t see your sister at the cinema. If she ______, she would have met my brother.
____ all behavior is learned behavior is a basic assumption of social scientists.