Complete the second sentences so that It has the same meaning as the first.

It was confident of him to say that he was the best student in his school.
=> He was………………………
Our lifestyle has changed considerably since the introduction of Western culture.
=> There has…………………..
It’s exciting for me to learn that I can come to visit my friend in Phu Yen next month.
=> I am……………………………
Those children need to be taught about how Vietnam has tranformed itself.
=> It is…………………………….

Here are my completions for the second sentences:

He was confident enough to say that he was the best student in his school.
There has been a considerable change in our lifestyle since the introduction of Western culture.
I am excited to learn that I can come to visit my friend in Phu Yen next month.
It is necessary to teach those children about how Vietnam has transformed itself.

Here is a brief explanation of each completion:

For the first sentence, I used the phrase “confident enough” to convey the same meaning as the phrase “it was confident of him.”
For the second sentence, I used the phrase “a considerable change” to convey the same meaning as the phrase “changed considerably.”
For the third sentence, I replaced the phrase “it’s exciting for me to learn” with the phrase “I am excited to learn” to make the sentence more concise and direct.
For the fourth sentence, I replaced the phrase “need to be taught” with the phrase “it is necessary to teach” to make the sentence more formal and objective.

I hope this is helpful!