11.Preparing the new lesson at home is necessary for me. -> I ________________________________________________________________________________________ 12.They forbid me to look in the closet. -> I ________________________________________________________________________________________ 13. It is very important for us to do well at school. -> I must _______________________________________________________________________________ 14. My parents always refuse to allow me to stay overnight at my friend’s house. -> They never let ________________________________________________________________________ 15. It is not necessary for me to follow what my older brother says. (have to) -> _______________________________________________________________________________ 16. Parents are advised to spend more time talking with their teenage children. (should)  Parents ________________________________________________________________________ 17. Parents/ often/ remind/ children/ show respect/ the elderly/ greeting them/ or helping them/ whenever possible. -> __________________________________________________________________________________ 18. It is very important for us not to go out during the violent storm. (must) -> We _______________________________________________________________________________ 20. Teenagers/ Viet Nam/ expected/ help/ parents/ the housework/ other home duties. -> ___________________________________________________________________________