How he _______ get out of the prison ______a mystery.

The head teacher insisted that every minute ______ made full use of ______ for the mid-exam.

－I want a room for 20 people to have a birthday party．一Unlucklly there is no one

―If the traffic hadn’t been so heavy, I could have been back by 6 o’clock―What a pity! Tina _______ here to see you

A cool rain was falling ____ with snow causing heavytraffic.