(1) Complete the following sentences; 1. Sound insulator usually covers ---------- surface of the wall. 2. Sound transmits through the parts of the building by impact and --- is a resin fast to dry,...

Extracted text: (1) Complete the following sentences; 1. Sound insulator usually covers ---------- surface of the wall. 2. Sound transmits through the parts of the building by impact and --- is a resin fast to dry, used to damp and absorb the vibrations of machinery parts and ducts. is a material used in acoustic insulation made of recycling tires. 3. 4. 5. Sound absorbed by the acoustic insulation material may convert to