He prefers to live in native Hong Kong ________ the United States, because he can’t ______ speaking English every day. 

 Doctors often advise us to pay more attention to our diets and mental health and to take ________ examinations.

The Students’ Union was founded for the________of them.

Fully ________ in preparing for the coming exam, she no longer has time to enjoy the various activities in her neighborhood.

 The young man is quite brave and strong. He is always ready to　　　　heavy responsibilities and turn down the light ones.