During World WarⅡ, Japan attacked Pearl Harbor without declaring war _____ America.
China has made a promise________ she will try her best to keep the world peace.
Mary, it's already 7 0'clock I'm afraid there is not much time ________for you to ________ for the ball.
They arrived at the farmhouse, in front of which________. A is sitting a boy B. sat a boy C. a boy sat D. a boy is sitting
All possible means ________been taken to prevent the river________.
The government is considering the environment-friendly plan which some scientists would like to see________soon.