At the back of the book _______ of the works available for further research.
I have no idea ______ measures the government will take to stop the air from being further polluted.
—Who bought you the fresh flower?—It’s from my girlfriend, if you ______ know.
Every man has his faults. We should, therefore, learn to be ______ of others.
— Do you think Li Hua has passed the English examination?— No, If so, he ______ us yesterday.
Daisy ______ all the housework, she dropped herself into the sofa, sighing with relief.