In this school, most students prefer taking pains in their studies to_________with a better education.
Do you know how long the dinosaurs _____ on the earth before their extinction?
Our class missed___ gold in the competition of volleyball, but will get ___ second chance in football..
________ the front door________, he had to enter the room through the back door.
The government has considered________ many steps ________the environment free from pollution.
You’d better focus all your attention on the class. ________ you’ll miss the most important points.