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It must be very costly to keep up a house like this.
The US hostages were held in Tehran for over a year.
Terrorists tried to hijack the plane in mid-flight.
The government failed to implement the plan.
The implementation of the program is a long task.
The school prepare students to make contribution to society.
contribution to charities are tax-free.
The government's actions are contrary to the public interest.
on the contrary
It wasn't a good thing, on the contrary, it was a huge mistake.
contrary to popular belief/opinion
Contrary to popular belief, a desert can be very cold.