1 . There is a general __________(recognize)that many teenagers don’t have scientific learning strategies. (所给词的适当形式填空)

2 . Festivals let us enjoy life, be proud of our ________ (custom) and forget our work for a little while. （所给词的适当形式填空）

3 . There is no time to waste, for I have a vital________ (appoint) to make at 4:00. （所给词的适当形式填空）

4 . We are taking out ________ (insure) to cover any problems that will probably arise in the journey. (所给词的适当形式填空）

5 . ________ (athlete) from all the countries are housed in the Olympic Village during the Olympics. (所给词的适当形式填空）

6 . Lin Qiaozhi gave some rules to follow to keep babies clean, healthy and free from ______ (sick). (所给词的适当形式填空)

7 . However busy you are, you ought to set aside some time for ________ (entertain). (所给词的适当形式填空)

8 . After that, ________ (dinosaur) developed. They existed on the earth for over 140 million years. (所给词的适当形式填空)

9 . Columbus Day is meant to celebrate the ________ (arrive) of Columbus in the New World. (所给词的适当形式填空)

10 . As many as 15,000 ________ (athlete) took part in the marathon race held in Shanghai. （所给单词适当形式填空）