it is generally thought that as teachers work with students, psychology course work is ______ to teacher-training.

He never exerts himself to aid those trying to ______ a...

单项选择题He never exerts himself to aid those trying to ______ a difficult situation.

The assassin hid himself carefully from view before ___...

单项选择题The assassin hid himself carefully from view before ______ his future victim.