My most devoted friend, Professor Yang, _______ often go hiking when he lived in the mountain that was covered with forest.
In order to get good marks, he has changed his attitude ______ study.
There is no ____ that 100 years ago animal testing was cruel, but today animals in experiments are very well taken care of.
He was about to make a call to Tom _____ Tom patted me on the shoulder.
She wondered uneasily what use she would _____ this opportunity.
His parents insisted that he ____ his name ____ the next year.