Complete the sentences with suitable expressions from the collocation box.Make changes where necessary. Sometimes more than one collocation is possible.1. _____________ is the cleanest and most abundant renewable energy source in the world.2. With the help of technicians,_____________can be installed without damaging the roofs.3. A(n)____________ is a group of consumers that show some level of interest in a market offer.4. The bicycle shop has ______________ by combining mail order and retail sales.5. ______________ abroad is more difficult than developing new businesses.