Professor Jordon is well known for his_____ into the habits of the common housefly

“Will you go skiing with me this wintervacation” “It______”

With the development of agriculture, the people_____ village I taught arenow living a happy life.

For many seniors in some universities, the final year can be an unpleasant experience, _________ that ends campus romance.

This college allows students to develop their own interests, to ______　extent they wished