He devoted most of his time to researching into space, believing his hard work would ______ sooner or later.

As we know, a good farmer can ______ a deserted place into a rich land.

She was good at physics _________she found it boring.

Pro. Smith will give us a report to ______ the world present economic problems.

—May I use your dictionary? I want to consult it．—It’s over there．____．