—Did you forget about my birthday?— __________ I've booked a table at Micheal's restaurant for this evening.
_______ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
_______ to sunlight for too much time will do harm to one’s skin.
The bell _______ the end of the period rang, _______ our heated discussion.
The research is so designed that, once _______, nothing can be done to change it.
The most important thing _______ we should pay attention to is the first thing ________ I have said.