Li Ling was a diligent boy . He ____ go to school though it was raining hard .
. By the time she ________ tomorrow, the work ________.
Some people waste a lot of food ________ others haven’t enough to eat.
When and where to build the new factory _____ yet.
I have many friends, ________ some are businessmen.
School children must be taught how to deal with dangerous ________.