请根据表格所列实验内容回答有关问题．

（1）A﹣D四组实验中，____ 组实验需要使用光学显微镜；使用高倍显微镜观察时，应调节____ 螺旋，直至看清物像为止．

（2）A组实验所观察到的颜色是____ ．在B组实验中观察到细胞质被染成了红色，说明____ 存在与细胞质中．

（3）在D组实验中，不能观察到砖红色沉淀的原因是____ 

（4）在C组实验中，若假设：原生质相当于一层半透膜．预测紫色洋葱鳞片叶外表皮细胞的中央液泡的体积在实验中的变化是____ 

    When you step into a new environment,you might have some difficulty in fitting in.Here are some tips____ might help you.

    Be confident.You are unique in this world.Spend some time thinking about your____(strong) and you will be able to build up confidence step by step.

Be kind to everyone.Kindness is the bridge to your own happiness.Always give more than you receive,and think more of others than of ____(you).A person who cares for others is popular everywhere.

    Be active in group activities.____ (vary) activities like playing football can help you to be known____others. You may add more friends to your circle.At the same time,you'll be amazed____(see) how much they like you.

    Be optimistic.Optimism____(make) both you and others feel pleased.It helps you make____good first impression.A pleasant smile costs the____(little) but does the most.If you follow the suggestions____(mention) above,you will be accepted by people around you.And you will fit in very well and enjoy your new life.