We’ll have a picnic in the park this Sunday ________ it rains or it’s very cold.

______ has passed the test will get a prize. 

_____is known to us all is that the old scientist, for____ life was hard in the past,still works very hard in his eighties.

---I think it’s going to be an argument.（争论）---Yes, it could be.---I wonder ______we can do .

Mr. Smith doesn't go to his usual club, ________ it is being decorated these days.