All the athletes competed _____ each other for gold medals in the Olympic Games.
It is only when you nearly lose someone ____________ you fully realize how much you value him.
--I'm going downtown. --Come on. __________.
--Shall Mary come and play computer games? --No, __________ she has finished her homework.
--I'm sorry, I shouldn't have been so rude to you. --You___________ your temper but that's OK.
Whether ways will be found to stop pollution or not is just___________ worries the public.