1. (改写句子,句意不变,每空只填一个词)
We should make a contribution to protecting the environment. We should () something () to () the environment.
2. (改写句子,句意不变,每空只填一个词)
My mother still remembers the winter of 1976.A terrible earthquake happened then. My mother still remembers the winter of 1976 ()a terrible.earthquake ()