III. Choose the correct word from the brackets:

1. What will our homes be like 100 years (of/from/till/on) now? 2. I (know/say/tell/think) that we will have homes that are more environmentally friendly. 3. (Wherever / If / Because / But) this happens, we will use alternative (causes / means / sources / ways) of energy such as wind and solar power. 4. Life will be easier, (when/so/while / as) lights will go on and windows will open when we ask them to.​