China's fight against COVID﹣19 gives the world (宝贵的) experience.
We never (抄袭)others' homework.
My brother is used to (坐) with his friends under the tree.
唐老师的帮助让我上大学成为了可能.
他说他去过上海两次.
这本书是在去年八月份由她翻译成英语的.