A．hungB．hangC．hangedD．hangingShe ______ the washing out……

单项选择题Our society has changed and ______ in it.

单项选择题Do what you think is right, ______ they say.

单项选择题Living things are ______ cells, and cells do not grow to more than twice the size they were at first.

单项选择题Every director needs an assistant that he can ______ to take care of problems that may occur in his absence.

单项选择题No sooner had I closed the door than somebody started knocking ______ it.