Most of the evidence was destroyed in the fire. ______, it would be almost impossible to prove Jim guilty.

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

Professor Lee failed many times but he ________found a good way to solve the problem.

It is difficult for children to change their eating habit later in life. _____，parents should encourage healthy eating from an early age.

It rained that day and ________ the basketball game was called off.