—Excuse me, but can you tell me which road I should take to the post office?— __________ of the four roads will do.

I have made _______ clear _______ I have nothing to do with the accident.

All of the doctors have worked for a long time, but ________ of them stop to have a rest.

 _____ seen smoking here will be fined.

Protecting the earth is not ____ to be left to the government．Everybody should be concerned．