Gaping vs. yawning?

[Thunu]

Business Idiom in English, Intermediate level

ESL/EFL Test #127 "Ways of commenting", question 6

I sat through the concert feeling really bored and sleepy and had to stop myself from ......... several times.

(a) gaping
(b) yawning
(c) stretching
(d) crying

Business Idiom in English, Intermediate level

ESL/EFL Test #127 "Ways of commenting", answer 6

I sat through the concert feeling really bored and sleepy and had to stop myself from yawning several times.

Correct answer: (b) yawning
_________________________

Hello Teachers
Why dont we use "gaping" here?

Thank you

Thu
_________________
Reach an agreement as ploughing, don't let argument happen at crops.

[Alan]

Hi Thunu,

In both cases you are opening your mouth but with yawning it is when you are tired. 'Gaping' is when your mouth is open because you are surprised or simply when you are not thinking of anything in particular.

Alan
_________________
English as a Second Language
You can read my ESL story Present Simple

[Luby]

Good Evening!
Why is it written 'sat through the concert' why not 'i was in the concert'.I actually dont understand the grammar here and want to clear my concept.