—What do you often do ________ classes to relax?—Listen to music or walk around the school.A.overB.throughC.between
The number of the students in our school always growing.
Leaves fall _______piles ________the ground
They think wolves are dangerous _________humans so this leads _______the danger of wolves.
Wolves often work __________a team and they never kill for __________.
We should tell hunters _______tigers.