Boris has brains.In fact, I doubt whether anyone in the class has _______ IQ.

When I get puzzled about some difficult problems, my teacher always encourages me and says, “Take it _________ .”

Your letter will get ___ attention; they know you're expecting the answer.

 Polar explorers have to be extremely _____ to bear the climate and other hardships. 

 --- Are you _____with doing a lot of homework everyday?--- Sometimes I am. But as a student , we have to do so at present.