第一篇：第二篇：

第一篇答案：has taught,has,started。realised,chosen,pay,explaining,was helping,work,completed,had finished,teaches,felels,has changed,got,claimed,are not feel,is always trys,will participate,show,are working,to finish,will succeed。第二题答案：on ,to,across,at,of,by,of,in,in,to,against,in,by,of,in,at,across,up,down,to,down,at