We_______on this project for four hours. Let’s have a rest.
I _______ there little more than a week when I set to work with the scientist.
They __________ two free tickets to Canada, otherwise they’d never have been able to afford to go.
—Is there anything wrong, Bob? You look sad.—Oh, nothing much. In fact, I __________ of my friends back home.
The flowers were so lovely that they __________ in no time.
—Have you known Dr. Jackson for a long time?—Yes, since she _________ the Chinese Society.