The students need to be able to read _______and thoughtfully instead of accepting whatever they are taught passively[ ]

The students in our class aren’t as _____ as those in yours. But they are _______.

It puzzles the scientists _____ some mammals produce their young _____ others lay eggs

When I called at his home the other day, I found him sitting on an armchair, ___ in his hands.

Though ______ to see us, the professor gave us a warmwelcome.