---When did you learn the news that Obama made a trip to Canada as President? --- _________ was on my return.
The number of people invited ____________ fifty, but a number of them __________ absent for different reasons.
Neither Tom nor Jack and I ____ his students.
The League secretary and monitor________asked to make a speech at the meeting last week.
Wang Lin failed to be admitted by Hong Kong University last year,and only then________the importance of English.
—What happened over there? —They argued________the waiter________the price of the meal.