It is not ________ it is useful to study nature but he takes pleasure that the scientist study nature.

—Mum, where are my new socks?
— How _______ I know? You’d better not put your things everywhere.

In 2014, a series of important reform measures were introduced in China, many of which are so closely associated with the interests of the general public _______ almost each person could benefit from in life.

Daniel is one of the students in the class who never _______ a mistake even when it is pointed out to him.

On top of a gardener, Mrs. Johnsons has also taken up an _______ as a wine-maker.