All people, ______ they are old or young, rich or poor, have been trying their best to help those in need since the disaster.
--- How long are you staying? --- I don’t know. .
The building _______now beside the park was designed by a famous designer.
____ be sent to work there?
There was a terrible noise _____ the sudden burst of light.
If a thing is worth ______, it must be well ______.