At the meeting, student representatives ________some very good suggestions.
| A．put out | B．put off | C．put forward | D．put down |
It might have saved me some trouble ______ the schedule.
| A．did I know | B．have I known |
| C．do I know | D．had I known |
The university started some new language programs to _____ the country’s Silk Road Economic Belt.
| A．apply to | B．cater for |
| C．appeal to | D．hunt for |
It is so cold that you can't go outsidefully covered in thick clothes.
| A． | if | B． | unless | C． | once | D． | when |
_____ Li Bai, a great Chinese poet, was born is known to the public, but some won’t accept it.
| A．That | B．Why | C．Where | D．How |
Much time _____ sitting at a desk, office workers are generally troubled by health problems.
| A．being spent | B．having spent |
| C．spent | D．spending |