.Through the open window we saw on the floor the happy father lying ________ his stomach, his daughter riding excitedly on his back.
All of my teachers but the math teacher ______ he cheated in the exam.
The teacher told us that everyone has an important role ________in protecting the earth from________.
When I enter this classroom, I always feel the ______ pressure of study, for I have so many opponents to compete with.
Those who failed to get into the art exhibition ________ disappointed as many of the artists who should have appeared did not come.
_____ achievement, last week’s ministerial meeting of the environment here earned a low, though not a failing grade.