1.  Some experts says that if you want to make one thing unforgettable, after you bear it in mind, you should repeat it 5minutes later, 20 minutes later, after 1 hour , after 1day, after 2 days, after 5 days and after 14 days.

2.  Most industry experts say the Internet needs to develop some payment scheme.

3.  As many experts said "Imitated, Never Duplicated", Apple has been a legend in history.

4.  Some experts say that because bonds between boys are based on doing things together but girls regard conversation as the cornerstone of friendship.

5.  As to the way to increase scientific literacy, the real engine, experts say, is the schoolroom.

6.  The real engine, experts say, is the schoolroom.

7.  Most industry experts say the internet needs to develop some payment systems, but the industry has not figured out how to calculate who owes what to whom.

8.  And by now, they don't charge each other, though Internet experts say they should.

9.  As experts say, the real engine is the schoolroom.

10.  However, backbone providers don't charge each other though there are differences between them, but most experts say there should be some payment schemes.