If you................. ( heat) ice, it ......................( melt ) •2. The box ................( open) when you .................. ( press ) this button -•3. If he ...................... ( not / know) a word, he .................. ( look ) it up in a dictionary •4. If I .............. ( read) a lot, my eyes .............(hurt ).•5. She ................ (ask) her mum for help if she ................. ( need) it•6. I ........................ (go) to work by train if the roads ................... ( be) icy -