In all kinds of competitions, Jackie ______ a most excellent athlete. He has won many gold medals. [ ]

Professor Smith, along with his assistants, _____on the Project day and night to meet the deadline.

I think you could complain, ___, of course, you are happy with the way things are.

Our bad living habits will destroy the earthOnly by changing________we live can we save the earth

y have , you should gather your courage toface the challenge