->
B. Combine the following sentences using "and" or "but".
46. This backpack has small solar panels on it. You can actually use them to charge your phone.
->
47. Nuclear power is a clean and efficient way of producing electricity. It may be dangerous.
48. In 2020/ Vietnam/get/energy / solar power / 2021.
49. Natural gas / produce / energy / in 2020/2021.
1
50. Vietnam/get/ energy/from / coal / other energy sources.