他们认为一天刷两次牙是一个好习惯.
They think it's a to brush teeth .
It's (晴朗的) and warm in spring in Suining.
Be careful when you (横穿) the busy street.
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.