Only by hard working can you _______ the goal.
Almost 90% of the most popular video games contain violence, and ________ of it is extremely violent.
I don't like football; as for me, ________ would be more fun than watching a 90 minutes' boring match.
Teaching is ________ everybody can do; it requires patience as well as professional training.
We've been looking for a cheap house but haven't found ________ yet.
It makes good sense to buy a large packet because ________ will work out cheaper in the end.