nd that complex problems, especiallythose _____ abstract thinking, were best for picking out bright and dullstudents

Johny , you ____ play with the knife , you ____ hurt yourself .

______ you can chat with yourfriends, makes communication easy

下列诗句与“竹深喧暮鸟”对仗工整的一项是（ ）

Mrs. Smith is an old friend of _______.