Sempoma is a wonderful place that photographers should never miss. The photos taken in Sempoma have ____ many big prizes in international photo competitions. It's a favourite place for those who take great ____ in photography around the world. People in Sempoma are not only friendly but also

____They are always glad to be your models (模特). People there are good at driving the boat ____the children. Life of the children in Sempoma is very simple. They have no homework to do because they do not ____ school. They have ____to worry about and they play ____every day in the water. If you ever go to Sempoma, make sure you find an experienced ____guide.

    He or she will lead you to all the fantastic sights.

物体放在凸透镜前，到凸透镜的距离是16cm，此时光屏上得到的是放大的像。则所用的焦距很可能是（     ）

实验是化学学习的一种重要手段，如利用电解水实验可探究水的组成．请根据电解水实验回答下列问题：

通电后电极上出现____ ，并汇集到试管上端．负极产生的气体与正极产生的气体的体积比为____ ，经检验，负极产生的气体是____ （填化学式），正极产生的气体是____ 　（填化学式）．

Lily is ______ beautiful than Mary. 　　

下面句中“一个伟大的计划”是针对什么而言的？

麦隆内夫人想到一个伟大的计划，她要美国人赠送一克镭给居里夫人。