Viết lại câu sao cho nghĩa không đổi: Julia has been working for this company for six years

1)Julia has been working for this company for six years 
-> Julia started...................................................... 
2) Let's go to the beach now. 
->  Why don't.......................................................... 
3) How about having pizzas ? 
-> let's....................................................    .......
4) Flowers won't bloom if there isn't enough water
-> Unless ...............................................................
5) Study harder or you'll fail the exam
-> If you........................................................