А) must. я думаю что это правильно ; )
I listened to music
I will listen to music
I am listening to music
I was listening to music
I will be listening to music
I have listened to music
I had listened to music
I will be listened to music
My mum is older than me.
<span>English is easier than Japanese.
</span>The dog is bigger than the cat.
<span>She said that she had to(must )write a report that day.</span>
Клетка - cell
умный - clever
товарищ - companion
аквариум - aquarium
дружелюбный - friendly
трава - grass
семя - seed