1 . They offered to send me to the airport, ________ I was very grateful for.

2 . 假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（Λ），并在其下面写出该加的词。
删除：把多余的用斜线（\）划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1.每处错误及其修改均仅限一词；

2.只允许修改10处，多者（从第11处起）不计分。

Within a few month, we are going to have a new set of banknotes. These bills will have new security features, that will make printing fake money even harder .

We’ve been using banknotes for around 1,000 years. Back in the Northern Song Dynasty, the world’s earliest paper money naming jiaozi was made by Chinese people. Obvious, paper money is cheaper to make and easy to carry than metal coins. But now, in the digital age, paper money seemed to be disappearing. From supermarkets to street stalls (小摊) , people pay by use the Wechat Wallet and Alipay apps on your phones. But some say it may be take a little longer than you think see paper money go away.

3 . Lawrence Craven, a doctor from the USA, is the author of several published reports, one of ________ introduced the idea in 1953 _________ aspirin could reduce the risk of heart attacks.

A．them; when

B．which; that

C．what; that

D．which; when