Mary finds reading the textbook frustrating 同义句

Mary finds reading the textbook frustrating 同义句
Mary finds ___ frustrating ___ read the textbook.
Mary find readings the textbook ___ frustrating.
am,doing,english,I,a,about,survey,learning(连语成句)

1.it to
2.\
3.I am doing a survey about learning English
再问： 第二个不知道吗，还是谢谢你