例句： America's invasion of the country must be done for unspeakable political purpose.

例句： My principal concern is my family's welfare.

例句： She had adequate grounds for a divorce.

例句： In his youth he was an extravagant epicurean.

例句： The teacher warned them that she would punish anyone who stepped out of line.

例句： The television is too loud; turn the volume down.

例句： He fell downstairs and broke his wrist.

例句： I'm bargaining on your help to drive us to the airport.

例句： Has the revolt been contained?

例句： If the tree falls that way, it will destroy the house.