妈妈经常告诉我不要浪费食物.
Mom often tells me food.
Prepare yourself for everything (在前面) of time, and you will be successful.
Doing sports can make people happier, (健康), and more confident.
Flying in the sky, we can see the fascinating city (在下面).
In the face of danger, all the firefighters were brave and (没有一个) of them gave up.
到目前为止,他还没有读完这本关于太空的书.(finish doing)