Առաջադրանք՝ Filling the correct option

Choose the correct option: must or mustn't. Write down only the modal verb as it should be written in the sentence.

Passengers _____ fasten their seat belts.

Answer:

Մուտք կամ Արագ գրանցում

Սխա՞լ ես գտել

5. Filling the correct option