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1. Students in big cities can now find a lot of informations available on the Internet.
2. At December 25th every year, people the world over celebrate Christmas.
3. The children were so exciting that they talked about the show all night long.
4. Those tourists were interested in the historic sites in the city such like the tunnel of Cu Chi.
5. By the time we will get there, all of them will have left the meeting, I suppose.
6. Drug abuse has become one of the most seriously social problems that need immediate attention.
7. The extinction of some wildlife has raised an alarm on the way humans acting towards nature.
8. The girl ran out, looking horrified and scream wildly for some reason nobody knows.