如图为一氧化碳还原氧化铜的装置图：

（1）实验开始后，图中A、B两处的实验现象是：A处______；B处______．

（2）A、B两处发生反应的化学方程式是：A处______；B处______

（3）该装置中存在的主要问题是______，你的改进措施是______．

用所给词的适当形式填空。(5分)

小题1: —I like taking photos very much.

—Why not______(buy)a camera by yourself?

小题2:There are______(thousand)of trees in this mountain.

小题3:Tom is good at______(ask)questions when he was young.

小题4:Here______(be)some flowers for you.

小题5:What about______(have)lunch with me, Danny?