单项选择题
The rest of the family had nearly reached the river, but Jane was（）behind as usual.
A.declining B.delaying C.lacking D.lagging
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.
单项选择题 If your baby is losing weight, you should（）your doctor promptly.
