There is a new problem involved in the popularity of private cars ________ road conditions need ________.
A．that；to be improved B．which; to be improved
C．where；improving D．when；improving
Isn't it time you got down to ________ the papers?
A．mark B．be marked
C．being marked D．marking
I can't stand ________ with Jane in the same office.She just refuses ________ talking while she works.
A．working; stopping B．to work；stopping
C．working；to stop D．to work；to stop
________ blood if you can and many lives will be saved.
A．Giving B．Give C．Given D．To give
The traffic rule says young children under the age of four and________ less than 40 pounds must be in a child safety seat
A．being weighed B．weighs
C．weighed D．weighing
Please do me a favor—________ my friend Mr.Smith to Youth Theater at 7：30 tonight.
A．to invite B．inviting C．invite D．invited
