题目内容：

用适当形式填空
He used his car_____(most) for sightseeing
To work hard is the key to ______(succeed)
it's sometimes called______(recycle) material

优质解答

He used his car__mostly___(most) for sightseeing 副词主要用来 观光
To work hard is the key to ___success___(succeed) 需要填名词
it's sometimes called__recycling____(recycle) material 可循环可利用材料recycling material