Lily, ______ do you study for a math test—By asking my teacher for help.

The doctor told him _______ more water.

Once we _____ some knowledge, things do not become more difficult, but comprehensible.[ ]

_______ made her struggle to become an artist so hard?— ______ she was a woman

Linda, why not drive Zhongshan Road?— It’s blocked because a subway ______ there