We should help our parents do some housework.The main structure of the sentence is _______.
The little boy denied ______ the window with a stone.
My mother didn’t expect ______ such a lovely present from me!
The Trojan War ______ by Helen and her beauty.
When the teacher ______ how to do the experiment, the bell rang.
I ______ my mind to study harder since I visited the Shanghai Supercomputer Centre.