I have a ___________. Maybe I ate some bad food for dinner last night.
Did your father tell you _______?
Nowadays, more and more people would rather ____ __ in the country, because there is ______pollution there than in the city.
Dr. Ma is strict ______ local doctors and nurses, especially________their skills.
---When did you go to bed last night? ---______________
It rained so_______ that people could _______ go out yesterday morning.