He passed the exam because of his hard work.（改为同义句）

He passed the exam because of his hard work.（改为同义句）
He passde the exam ______ _______ ______ ______ his hard work.
2.Tom planted twenty more trees yesterday.(改为同义句）
Tom plantde ______ ______ ______ yesterday.
3.I speak loudly in order to make the students understand me.
I speak loudly in order to ______ myself _______.
4.The flowers on display are very beautiful.
The flowers ______ ______are very beautiful.