Could, mustn´t oder needn´t exercises?

Setze could, mustnīt oder neednīt ein.

1. We forget our maps! They´re important.
2. We take the bus. We can go by Tube.
3. you drive me to Big Ben, please?
4. It´s red. You cross the road!
5. We go to the London Eye. I went there last year.
6. Ben, you please sit next to Jake?
7. You forget to visit London Eye. It´s great!
8. The sign says you use your mobile!
9. You buy me a ticket. I have one.
10. I send you a text message but my battery is dead.