单项选择题
A．He grieved to death over the loss of his wife. B．He committed suicide for unknown reasons. C．He was shot dead at the age of 40. D．He died of heavy drinking.
A．Accurate communication is of utmost importance. B．Pilots should be able to speak several foreign languages. C．Air controllers should keep a close watch on the weather. D．Cooperation between pilots and air controllers is essential.
A．Packing up to go abroad. B．Brushing up on her English. C．Drawing up a plan for her English course. D．Applying for a visa to the United States.