—What do you think of Andrew?—There are some things that are not easy to __________ and his coldness is one.
Mary as well as her sisters ____ Chinese in China.
Neither Tom nor Jack and I ____ his students.
The rich ____ not always happy.
I, who____ your friend, will try my best to help you with your English.
The United States of America _____one of the most developed countries in the world.