Samuel Clemens, _____ Mark Twain, became a famous American writer.
Though we take a great risk of investing in the project, yet it will ______ in the long run.
Although a teenager, Fred could not resist ______ what to do and what not to do.
The child is much too young; I object ______ him alone at home.
We are bound ______ with difficulties in carrying out this research.
________ is often the case with elder people, my grandma talked about my new hairstyle for at least 50 minutes nonstop.