3. a ball-point pen may be cheaper. 4. did he drop bob’s money? 5. this job pays well. 6. he came back to buy more pins. 7. mike may bring my bike back. 8. be more careful; don’t rip the map. 9. mary may drop by before she leaves. 10. he came by cab, but i came by bus. 11. he pays two pennies for empty bottles. 12. push the button before .