  We report an extension of our program to search for radio-quiet BL Lac
candidates using intra-night optical variability (INOV) as a probe. The present
INOV observations cover a well-defined representative set of 10 `radio-quiet
weak-emission-line quasars' (RQWLQs), selected from a newly published sample of
46 such sources, derived from the Sloan Digital Sky Survey (Data release 7).
Intra-night CCD monitoring of the 10 RQWLQs was carried out in 18 sessions
lasting at least 3.5 hours. For each session, differential light curves (DLCs)
of the target RQWLQ were derived relative to two steady comparison stars
monitored simultaneously. Combining these new data with those already published
by us for 15 RQWLQs monitored in 30 sessions, we estimate an INOV duty cycle of
$\sim 3\%$ for the RQWLQs, which appears inconsistent with BL Lacs. However,
the observed INOV events (which occurred in just two of the sessions) are
strong (with a fractional variability amplitude $\psi >$ 10\%), hence
blazar-like. We briefly point out the prospects of an appreciable rise in the
estimated INOV duty cycle for RQWLQs with a relatively modest increase in
sensitivity for monitoring these rather faint objects.
