Choose the correct word.

1) They will phone us as soon as they will arrive/arrive.
2) Mother was cooking as/while father was pottering in the garden.
3) You should wash your hands before eating/eat.
4) They trusted him but first of all/eventually they realized that he was a liar.
5) She waved goodbye just as/while I turned back.
6 The postman came as/finally he was leaving his office.