1.he made it possible for us to socialize with more people,but most of them were just casual acquaintances. 2.there is no need for our parents to be involved in our domestic affairs. 3.Not until she invented a new medicine did she become famous in the medical society. 4.It is well known to all that success comes from hard working,without which nothing can be achieved. 5.Up to today I can still remember the day when i walked into that high school for the first time. 6.Life can never be smooth all the time and you should prepare to face one challenge after another with courage.