----- Why does Sara know so much about Angkor Wat? ----- She _________ have been there, or….
_______ that he made an obvious mistake, Jeff went on with his speech.
ack went to college last year, _______ to return home until he achieves his goal.
_______ 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.