It is generally believed that teaching is ________ it is a science.
--Is there anything else that I can do for you? --No, thanks. I’m very ________ with what you have done for me.
I know that smoking is a bad habit, but I can’t ______ myself of the feeling that I need to smoke.
The number of the students is_________ rapidly in our school.
During your English study, you will______ many difficulties.
Hiking by oneself can be _______ and good for health. It may also be good for_______ training.