【正文】
On e day , Mr . Li was rea ding a bo ok in his of fice a fter sch o hi s su r pr ise , a bal l flew i n s udde nly an d hurt him o n the head. He to ok the b al l t o the window , but he only sa w a gr oup of boy stu de nts run ni ng away quic kly an d disap pear i ng i n a m inu te .H e sat do wn a gain an d c on ti nue d his read i it go t dark , it was ti m e for him to le ave for hom king at t he ball , he w ondered wh at to do wit h it . He knew t he owne r of t he ball m us t be nearby a nd wish ed to get it bac wen t dow ns ta i rs a nd wal ked to the play gro was at th e center of t he play gro und th at he pl aced the ball with a piece of pa per , on w hich he wrote “ Be ca r efu l ne xt tim e ! ” . T hen he w al ke d a way . The ne xt m ornin g , as Mr .L i open ed the of fice do or , he f ound the sa m e piece o f pa per on the flo or .S om e w ords w e re added after h is words : “ Tha nk yo u for yo ur k i ndne , you a re a cleve r fell ow . ” ( ) 34. What h ap pe ned whil e Mr .Li was read i ng in his of fice ? A . T he win dow was bro ken by a ball. B . A ball h urt h im o n the h e ad. C . A ball hit t he win dow . D . T he doo r was bro ken b y a b al l. B ( ) 35. Why d id t he owne r of t he ball ru n a way quic kly ? A . He was a fr