单项选择题
When the new assembly line is complete, the factory will turn ______ one thousand cars per day.
单项选择题 This platform would collapse if all of us ______ on it.
单项选择题 The young man who saw the car ______ into the river telephoned the police.
单项选择题 Since most doctors are ______ about effectiveness of the new medicine, they seldom recommend it to their patients.
