11.I believe you because I know you are ……………………………...............                  (truth ) 12. Ba likes collecting stamps in his free time. He is a stamp………………………(collect) 13.Computer are popular………………….…………........…nowdays                                 (world) 14. Here is the weather forecast for tomorrow. Thanh Hoa will be clear and…………....(cloud) 15. We use solar energy for our………………………….….life                                     (day)