注意：（1）每处错误及其修改均仅限一词； （2）只允许修改10处，多者（从第11处起）不计分。 last saturday, mom and i went to buy a down jacket for my grandpa. when we got to a big store, we saw down jackets of vary colours and styles. there were so many of them that it spent us quite a while to decide which one to buy. finally, under the help of the shop assistant, he selected a black thick jacket f
