persist

如果症状持续，请咨询医生。

If symptoms ___persist, consult a doctor.

尽管有警告，许多人仍然坚持浪费用水。

Despite warnings, many people ___persist in using water wastefully.

如果你坚持这种行为，你会疏远你的朋友。

If you ___persist in this behavior, you will alienate your friends.