______ strong-minded the teachers are, they should give their students enough time to share their ideas in class

o Chinese scientists have made a wonderfuldiscovery, which marks a major _______ in the basic research in the field.

The children without parents ______ good care of bytheir teachers in this special school.

It was silly of him to his notes during that important test， and as a result， he got punished.

Wang Tao used to ______ QQ games in his spare time but now he is used to ____ sports.