________ a child begins school, he enters a world of fierce competition where success and failure are clearly defined and measured.
I want to buy that kind of cloth because I ________ the cloth_______ well.
______ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
To keep healthy, Professor Johnson ______ cycling as a regular form of exercise after he retired.
Time should be made good use of ___ our lessons well.
Tommy is ____ only child in the family, so his parents make ____ fuss of him.