Do you think vegetarians are ... people who eat meat? (healthy)
healtier than
What's ... brand and model of phone you've ever had? (good)
the best
How important is it to you to have ... gadgets? (late)
the latest
Which do you think is ... - a yellow bedroom or a black bedroom? (good)
better
Are you ... in the mornings or at night? (creative)
more creative
Who's ... person in your family? (lazy)
the laziest
Who's ... person you know? (old)
the oldest
what do you think is ... form of transport? (safe)
the safest
If you wanted to get ... you are now, what should you do? (fit)
fitter than
What's ... meal you've had recently? (delicious)
the most delicous
Are you ... during the week or at the weekends? (busy)
busier
Do you think that buying something online is always ... buying it from a shop? (cheap)
cheaper
Apart from English, what would be ... language for you to learn? (useful)
the most useful
When you feel stressed, what do you do to feel ..? (calm)
calmer