He was used to being made fun of.
We know this by him taking this reply in ‘with a sort of humble patience’. This means that he has experienced this kind of teasing - or even bullying before and he is used to it.
Answer:
brush your lips with hard toothbrush
Something that is physically existent and can be touched eg tangible goods
I believe it is
<span>a) Khánh hears the ticking of the clock.
</span>
I hope this helps!
<span></span>