It is generally believed that teaching is _____ it is a science.

Middle school students hardly know anything aboutshopping online, ____ they? — ________. It’s very popular withteenagers.

Now that the banks are back on their feet, we expect the extraordinary______ from them to help rebuild the economy.

He and his wife have the same ________; they both want their son to go to college.

The action film has attracted (吸引) millions of young people to the cinema.