It is reported that very little use of these waste materials_______ in the past decades

下列各句中没有语病的一句是

______, his leg got better and he could walk with a walking stick.

﹣Don’t be angry with your kid when he makes a mistake again，will you﹣No，I won’t．I know that ______of us are perfect after all．

There is a teacher’s desk _______ of the classroom. Mr. Liu is standing _______ of it.