_______ may have a chance to be successful if he tries his best.

I’m moving to the countryside because the air there is much fresher than _______ in the city. 

Since _______ comes, let’s begin our discussion.

CCTV-10 often plays _____ around the world . It can help us learn more about not only nature but also different cultures and customs.

Your computer doesn’t work now, is there ________ with it?