这种药应该很快就会见效。

The medicine should ___take ___effect quickly.

这项新政策只在某些地区生效，并未在全国范围内实施。

The new policy only ___took ___effect in certain regions, not nationwide.

法律修订将于一月一日起生效。

The changes to the law will ___take ___effect from the first of January.