The conservation area is very important for preserving many animals and plants, which would ______ run the risk of becoming extinct

Though ______ to see us, the professor gave us a warm welcome.

However busy we are, we need to take exercise. Not only _____ us keep healthy, it also stops us getting fat. [ ]

Do you plan yourhomework at home—Yes, of course.

s, Mark ,what is the____ of the American Civil War Well, is it because the black slaves wanted freedom