用look 的相关短语填空 ____!there is danger ahead please___the word i

用look 的相关短语填空 ____!there is danger ahead please___the word in the dictionary.
i have to___my mother at home .she is not feeling well
I'm____visiting the Great wall.
Don't ____the window in class.
—What are you _______?
—My pen
Please________the blackboard.
He__________my brother
Let me_________,please.
He_____,but didn't see anyone