Today is rained ,so we went to amuseum(博物馆).It was36boring. Ifound(发现) a small boy37in the corner. Hewas lost(迷路) and I helped him find38father. That 39me feel very happy. I didn’t have40money for a taxi, so we walked back41 ...
There are many problems in our modern world. One very serious problem is energy. We get a great (71) of energy we need from coal, gas, and oil. However, the (72) of energy which we use is (73) every year, and we only have enough coal, gas, and oil for the next twenty or ...