We work together to achieve our common purpose:_________world that is safer, cleaner and healthier than one we found.
John knocked at the door for nearly five minutes____his wife opened it.
---The thread of my kite broke and it flew away. ---I told you it would easily break_____was the weakest.
They were surprised that a child could work out the problem____they themselves couldn't.
.I had been puzzled over the problem for over an hour without any result, _____ all at once thesolution flashed across my mind.
Sally worked late in the evening to finish her report _____ her boss could read it first thing next morning.