Nowadays millions of people of all age take pleasure in a 1.
hobby which is both interested and fun.And every year 2.
more and more people start a stamp collection of your own 3.
and discover an interest which can even last lifetime.Starting 4.
your collection of stamps are easy because they are everywhere. 5.
Holidays and birthday postcards from relatives and letters 6.
from friends can all provide you for stamps from all over 7.
the world.So once you’ve started collecting seriously,you 8.
will probably want to join in the Stamp Collectors’Club 9.
which exist to add more stamps to your collection. 10. 1.age→ages
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(答案→)1.age→ages
解析：
1.age→ages 前面有all，此处用ages表示“各个年龄段”。
2.interested→interesting 表示主语的性质，此处用interesting。
3.your→their 根据逻辑分析，此处用their和前面的people一致。
4.last后加a lifetime“终生”为可数名词。
5.第一个are→is 主语为一个动名词短语。
6.Holidays→Holiday 这里holiday和birthday都是作postcards的定语。
7.for→with 短语结构provide sb. with sth.“向某人提供某物”。
8.正确。
9.去掉in join用作及物动词表示“加入”某一组织或团体，而join in的意思为“参与”某项活动。
10.exist→exists