
Which brings us to 10th grade.
The Big Bang Theory Season 2, Episode 12

...I've provided substitutes
WHICH will exercise your fine motor skills.
The Big Bang Theory Season 2, Episode 23

You know WHICH yogurt I mean.
The Big Bang Theory Season 8, Episode 24

...WHICH would reduce Wolowitz
to a wheezing 97-pound blister.
The Big Bang Theory Season 2, Episode 21

Which project
are you gonna pick?
The Big Bang Theory Season 12, Episode 7