_____we are closely united, we can surely overcome these difficulties.

 ________ was known to them that the boss had broken his promise ________ he would give them a rise.

    everybody enjoys fresh cut flowers around his house．few people know how to keep them for as long as possible．

She was so angry that she rushed out into the rain ______ I could stop her.

It's important to learn how the whole system works. Sometimes, ________， it's the details that interest us the most.