Ⅰ.单词拼写
1．They united as one and overcame difficulties caused by the natural disasters(灾难)．
2．It was a terrifying(令人害怕的) experience and I don't want to mention it any more.
3．Fortunately/Luckily(幸运的是)，the fire was discovered and put out soon after it had started.
4．Since light travels faster than sound，we see lightning(闪电) before we hear thunder.
5．After a clear sky and calm weather，clouds gathered and a storm burst，and it rained with a very violent(猛烈的) shower.
6．Several cars piled up after ignoring the fog warning(警告) on the motorway.
7．He refused to rule out the possibility(可能性) of a tax increase.
8．I remember you mentioned the same thing on a previous(先前的) occasion.
9．They took active(积极的) steps to prevent the spread of the disease.
10．Worldwide(全世界的) English broadcasters were on hand to describe the event as it happened.
