1. It was confident of him to present his ideas in front of the committee.

It + to be + adj (dùng chỉ người) + of sb + to do St : Ai đó thật ... khi làm gì...

2. It was surprising for us to get the scholarships.

It is + adj (thường dùng chỉ vật)+ (for sb) + to do St: Thật là.... cho ai đó....để làm gì

3. After having taken several steps to whiten the palm leaves, they sew together the leaves and the rings.

Hoặc: They sew together the leaves and the rings after having taken several steps to whiten the palm leaves.

4. Chicago is the third-largest city in the U.S.

1, it is so confident that he could present his ideas .........

2, it is surprised that we got the ........

3. after the workers had taken .......leaves, they saw........

4, Chicago is the third city in US after Los Angeles and New York.