Sure! Here are the completed sentences:

1. Luke **must** drive to work these days because the buses don’t start early enough anymore.
2. You **mustn't** spend much time on video games.
3. We **mustn't** forget to send a birthday card to Lily.
4. She **must** remember to take the sun cream because the weather is so hot on the beach.
5. Ba is so thin. He **mustn't** eat very much.
6. Our exams are coming so we **must** study hard.
7. There is no food in the house. We **must** go shopping for food in the supermarket.
8. You **mustn't** litter on the street.
9. Mr. Hai takes the bus to everywhere. He **must** come to the bus stop on time.
10. Students **must** obey their parents at home.