4) If you are aged over 18 andin good condition, it's completely safe todo the job.如果你已年满18岁且身体状况良好，那么做这项工作是完全安全的
4) If you are aged over 18 and _, it’s completely safe to do the job. in good condition 如果你已年满18岁且身体状况 良好，那么做这项工作是完全 安全的
5) Plastics can be made hard as stone, strongas steel, _transparent_ as glass, and lightas wood.塑料能够制造得像石头那样坚硬，像钢铁那样坚固，像玻璃那样透明，像木头那样轻
5) Plastics can be made hard as stone, strong as steel, _ as glass, and light as wood. transparent 塑料能够制造得像石头那样坚硬，像钢 铁那样坚固，像玻璃那样透明，像木头 那样轻
hard6) Coat the shoes with polish, thenrubwith a soft cloth to give a shine把鞋油擦到鞋上，然后用软布用力摩擦使鞋发亮
6) Coat the shoes with polish, then _ hard with a soft cloth to give a shine. 把鞋油擦到鞋上，然后用软布用力摩擦使鞋 发亮。 rub
joke to7) It was probably just aspicythem, but it wasn't funny to me at all.对他们而言，那也许只是一个活泼的笑话，但对我而言，那笑话一点也不好玩spicy:尖酸苛刻的，活泼的
7) It was probably just a _ joke to them, but it wasn’t funny to me at all. 对他们而言，那也许只是一个活泼的笑 话，但对我而言，那笑话一点也不好玩。 spicy:尖酸苛刻的，活泼的 spicy
8) Michael's praise for my wife opened my eyes andtaught me to show gratitude for her day-to-dayheroism, which I hadhitherto_ taken forgranted.麦克尔对我妻子的赞赏使我认识到要感谢她经常表现出来的勇敢行为。而迄今我还一直对此持想当然的态度。hitherto:迄今，到目前为止The weather which had hitherto been sunny andmild, suddenly turned cold迄今一直晴朗温暖的天气突然变凉了
8) Michael’s praise for my wife opened my eyes and taught me to show gratitude for her day-to-day heroism, which I had _ taken for granted. hitherto 麦克尔对我妻子的赞赏使我认识到要感谢她经 常表现出来的勇敢行为。而迄今我还一直对此 持想当然的态度。 hitherto:迄今，到目前为止 The weather which had hitherto been sunny and mild, suddenly turned cold. 迄今一直晴朗温暖的天气突然变凉了