History is the best teacher. It _______records the development path of each country and foretells the future to us.

The bank refused to give the company more time, and ________, it broke down.

Everything seems to be going______for the first two weeks after I moved to London.

After two years’ research, we now have a __________ better understanding of the disease. 

Plants need water and sunlight to grow well. _____, a healthy body requires a balanced diet.