... replacement for oil, natural gas and petrol Beside the advantages, solar power also has some problems.First,solar energy reaching the Earth’s surface is widely separated.As a result, it has to be collected ... readily available.For example, if only 1% of the never – ending solar energy falling on the Sahara Desert could be converted into electrical power.It would supply all the world projected energy needs ... A.happy B happier C happily If we plant more trees along the street, We will A have more shade and fresh air B have big floods every year C have droughts every year 9.My father forgot to ...