小题1:My reasons are as follows

小题2:I’m writing to tell you that my uncle is going to your city for a conference ,and

I’ve asked him to bring you the Chinese painting you’ve asked for before.

小题3:Only when we match our words with actions can we make a difference in the whatever we hope to accomplish.

小题4:It was my sister who first had the idea to cycle along the entire Mekong River from where it begins to where it ends.

小题5:In this letter I would like to convey my heartfelt appreciation to you for your kind assistance in my English  learning when I was in New York .

试题解析

小题1:考查固定短语：如下：as follows，所以我的理由如下：My reasons are as follows

小题2:考查并列句和定语从句。基本短语：给某人写信：write  to  sb  ,动词不定式做目的状语：to  do sth ,请求某人做某事：ask sb to do sth   定语从句：the the Chinese painting you’ve asked for before.

小题3:考查倒装句。Only + 状语或者状语从句构成不完全倒装句：Only when we match our words with actions can we make a difference，短语： make a difference 有作用，有影响，大不同。名词性从句：in the whatever we hope to accomplish.

小题4:考查强调句型。It was / is  + 被强调部分 + that + 其他成分。如果被强调部分是人，that可以换成who，所以It was my sister who first had the idea to cycle along the entire Mekong River from where it begins to where it ends.

小题5:考查动词convey。Convey：表达 convey one’s  thanks / appreciation to  sb ,向某人表示感谢。所以答案为：In this letter I would like to convey my heartfelt appreciation to you for your kind assistance in my English  learning when I was in New York .