答案U1-U3动词形式填空（一）1. is provided2. visiting3. to help4. Entering5. traveling6. (should) be handed7. is working out8. to stay9. starting10. to start11. seeing12. pressing/ to be pressed13. be informed14. affected15. to make16. is not allowed17. to stay out18. explaining19. being praised20. giving21. being knocked22. to tell23. Compared24. have heard25. living26. writing27. has been married28. required29. produce30. sung