"2 pairs of scissors"
It's ironic that in a lesson about classifiers, they left out the English equivalent of the classifier.
Accepted now, October 2020.
If you talk about one pair of scissors you can say "do you have the scissors" but here you talk about a quantity more than one and so must clarify that it is pairs of scissors being discussed. "Do you have two 'pairs' of scissors"
Word choice only has 'two scissors', does not have 'pairs' as an option.
The lesson said cây was for stick like things. Is it for office things?