20.What led to the __________ of the telephone? (invent)
21.The stores in the mall will offer a wider selection of ___________ (produce)
22.It will be more ________ to shop in the mall. (comfort)
23.The small store _______ think the mall will take their business. (own)
24.Her brother is very ___________, kind and generous. (social)
25.All those classrooms are___________ (air-conditioner)