Viết lại câu sao cho nghĩa không đổi
1.  They are painting the living room at the moment.
     The living room ________________________.
2.  John drives more carefully than his brother does.
     John's brother doesn't ___________________.
3.  Learning English is not easy.
     It is __________________________________.
4.  They were such difficult questions that we couldn't answer all of them.
     The questions were so ___________________. 
5.  I don't know her phone number, so I can't call her.
     If I ___________________________________.