Choose the correct options. (Chọn những lựa chọn đúng)

1. When my dad was younger, he can / could /will be able to play the violin really well.

2. If we sit at the front tomorrow, we'll be able to / could / couldn't hear the singer better.

3. You have to / should / mustn't listen to music on your bike because you can't hear the cars.

4. We don't have to / mustn't / must perform in the concert. We can choose to watch instead.

5. It's good to listen to classical music when you study. You shouldn't / should / mustn't try it.