---All the oil in the world will have __________ some day. ---Yeah. What shall we use for power at that time?
Tom studies _______. He _______ plays with his friends.
Eighty percent of the teachers ______ women teachers in our school.
Here ____ the results _____ the students activity survey.
When I______ at the hotel,it was very late.
He had to retire(退休)early _____ bad health.