Rewrite the sentences so that the meaning does't change:
1, My father continued working as a doctor last year.
-> My father went  ..............................................................................
2, They worked in this factory because of the high salary (because)
-> They ..............................................................................................
3, Paul is an Australian. He enjoys Vietnamese New year.
-> Although ..................................................................................
4, Although I was very hungry, I didn't eat anything.
-> I was .......................................................................................