Keeping a diary in English is one of the best ways to improve our English writing ability.

    Compared with other forms of writing, it is shorter and takes ____(little) time. It can help us to develop the habit of thinking in English.____we stick to this practice,____ (gradual) we'll learn how to express (表达) ourselves in English. In keeping a diary in English, we certainly run up against many ____ (difficult). In the first place, it often ____(happen) that we have trouble ____(find) proper words and phrases to give expression to our mind. And____ is very hard for us to put them into English properly.

    As far as I am____(concern), my suggestion is that we should always have a notebook and a Chinese­English dictionary within easy reach. We can also turn to our English teacher for help, if necessary. In short, I believe that it is ____great use to keep a diary in English for the development of ____ (we) writing skills.

如图所示，A、B分别是标有“6V  3.6W”字样的灯泡L和定值电阻R的U-I图像。则R的阻值为____ Ω；若把它们接入电路，当只闭合开关S₁时，L正常发光,此时电流表的示数为____ A；若再闭合开关S₃，电流表的示数为____ A；若只闭合开关S₂，电路消耗的电功率为____ W。