5. I want to put you on a very________(严肃)subject.　　　　　　　　　 　　　　　5____________

4. As everyone knows, he is a________(世界著名)expert on DNA.　　　　 　　　　　4____________

3. They had the building________(重建) after the fire.　　　　　　　　　 　　　　3.____________

2. The________(形势) both at home and abroad is excellent.　　　　　　　 　　　　2____________

1. In summer, a sudden change in t_____(温度) could bring rain.　　 　　　　　　　1____________

6.disaster　　　 7.celebrate　　　 8.strait　　　　 9.torn　　　　 10. historic

10. Please remember the ______(历史) moment, when Lianzhan came back to mainland after 60 years. 10.________

Keys: 1. graduation　 2.discovered　　 3.thoughts　　　 4.cure　　　　 5.shocked

9. The old houses have been t________ down.　　　　　　　　　　　　 　　9.____________

8. The Chinese mainland is separated from Taiwan by the Taiwan s________.8____________

7. On Oct 1^st, we warmly c________ our National Day every year.　　　　 7____________