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

The player kept on running ___ it was raining heavily.

 With April 18’s railway speedup, highway and air transport will have to compete with __________ service for passengers. 

The Internet is increasingly accessible at school and at home. _____many parents and teachers are sometimes not as prepared as we should be to warn children about Internet threats.

The charity sale our school organizes every year has taught us much. _______ we would never have learned it in class.