The government has raised the tax on urban building (房产税) with the ______ of controlling the price of buildings.

As a candidate, you must make a good _______ on everyone you meet if you want to win the election.

Teachers have to constantly update their knowledge in order to maintain their professional(专业的)_______.

It’s a major         for Obama and his national security team, to fulfill the goal once voiced by Obama’s predecessor, George W. Bush, to bring to justice the mastermind （设计者）of the 9-11 attacks.

There is a lot of love in today’s world and I’m convinced that this is still the most powerful ______ in the world.