It is obvious to the students ______ they should get well prepared for their future.
-That's the third time he's won the award in this field. -Yes. He __________ his maximum potential in the past decade.
Everything __________ doing is worthy of __________ well.
It is __________ that she helped other left-behind classmates with their lessons after school.
The __________ teacher thinks it is __________ to devote so much time to his students.
Although it is __________ to watch programs on TV sometimes, I think people shouldn't spend most of the time watching it.