Viết lại câu:
1. I work hard and i'll earn a lot of money
if..................................
2. He didn't pass the exam because he didn't study hard
if.........................................................................
had.................................................................................
3. You will catch a cold if you don't keep your feet dry
unless..................................
4. You shouldn't stay up late
you had................................
5. We'd prefer you not to smoke 
we'd rather.................
6. You are both funny and witty 
not only...............................