_____we are not attacked by nuclear weapons, we promise that under no circumstances _____ use the bomb first but we reserve the right to use it for counter-attack when necessary[ ]

It was never clear _______ the man hadn’t reported the accident sooner.

TV says there will be a storm tomorrow. –_______. I planned to go climbing with my classmates.

I was late for class yesterday __________ there was something wrong with my bike．

______ the Smiths moved to the country a year ago, they have been enjoying a better life.