单项选择题
It will be safer to walk on the streets because people will not need to carry large amounts of cash; virtually all financial（）will be conducted by computer.
A.transformations B.transmissions C.transitions D.transactions
单项选择题 The rest of the family had nearly reached the river, but Jane was（）behind as usual.
单项选择题 With the introduction of（）technology, information flows faster than it ever did.
单项选择题 I have worked on three（）Saturdays.
