It isn’t so much whether he works hard; the question is whether he works _____.

 He absorbed himself so entirely to his research that ____he made himself ill.

When I saw my teacher nodding _______ to me, I calmed down and went on with my performance.

During the summer vocation we went back to the school __ to pay a visit to our teachers though it was _____ hot.

She put some soil in the box, then sowed the seeds carefully, and covered it with more soil. _______ she kept the box in the shade.