1. Unless you study harder, you 'll get bad marks.
2. Unless you leave now, you'll miss the bus.
3. Unless he practice writing everyday, he can't impove his writing skill.
4. Unless you return this book to the library today, you'll have to pay a fine.
5. Unless you help me, I can't finish this work on time.
6. Unless you go out more often, you might fall ill.
7. Unless she does morning exercise regularly, she'll be overweight.
8. Unless you are absent from school, you don't have to write a sick-note.
9. Unless the seas get warmer, the ice at the North and Soulth pole won't melt.
10. Unless you are more careful, you'll have an accident.
