--Did you receive the letter the next day?--No, somehow, it was three weeks ______ I received it.
As the day was fine ,I made the suggestion _______ for a walk in the park .
It is uncertain ______ the experiment is worth doing .
I’d like to work with ____ is honest and easy to get on with.
Mary wrote an article on __the team had failed to win the game.
Do you have any idea ___ is actually going on in the classroom?