Xiaoming is used to send a lot of cards to his friends 1.
at new year time. And all his classmates did same. But 2.
on one day he read a report in the newspaper, which said 3.
that cards are made of trees. A large number of cards would 4.
consume a lot of trees but at present more and more trees have 5.
been cut down lead to serious floods in some areas. Xiaoming 6.
felt shocked at the report in the newspaper and realized the 7.
important of protecting trees, and then he shared this report 8.
with their classmates. From now on he decides to send his 9.
wishes to his friends by telephone instead sending cards. 10. 1. 去掉is
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(答案→)1. 去掉is
解析：
1.这里是过去常常寄贺卡给他的朋友们 used to do sth 过去常常做某事，而 be used to do sth 表示被用来做某事
2. 缺少定冠词
3.这是一个中国式英语
4.贺卡由树木制成，看不出材料
5.前后是并列关系
6.这里用进行时表伴随
7. 正确
8.这里是意识到保护树木的重要性，用名词形式
9.人称不一致
10. instead of doing sth 代替做某事，是固定词组