Efforts will be made to______ new teaching models to exploit the students’ potential.

I don’t think you should mention it at the beginning of the story, or it may ____ the shocking ending.

_____earth scientists understand how and why earthquakes happen, forecasts are usually inaccurate

16.Nobody knows who is the first one to add fertilizer ___ the soil to make plants grow better

Thedisappearance of dinosaurs made _______ the evolution and dominance of mammalson the earth