【单选题】This boy__________poems two years ago and now he has written many poems. [ ]
B.
tried writing C.tried D.tried
【简答题】The little boy tried to (performance) ______ well, but failed last night.
【单选题】下面哪些不是作业批改应注意的问题_____
【单选题】Every means_____been tried to save the boy.
【单选题】He tried his best to save the _____ boy, but the boy was _____ finally. [ ]