Any behavior that is repeated enough times will ________ become a habit and happen automatically.

You will find me online almost always, so there______ be any difficulty reaching me.

Recent research findings have ________ the origin of our universe, which has puzzled the scientific world.

by a greater demand forvegetables,farmers have built more green houses

Many died or returned home，but most remained in California to _____ a life for themselves in the new towns or on farms.[ ]