4. shopping online（互联）网上或在线购物
5. She wanted to take pictures of this trip.
take pictures of this trip在旅游中照相
6. As she lives out in the country, there is no place to buy a very good camera.
因为她远在乡下居住，那儿没有能买到很好相机的地方。
*句中as 是连词，作“由于，因为”解，引导原因状语从句。Because，since，as，for都是说明原因的接续词，because语气最强，表示理由充分，有必然的因果关系，其次是since，表示一种间接或附带的原因，再其次是as、for，只是说明一下，关系是松弛的。如：
Everybody likes Tom, as he is kind and honest. Yesterday, we stayed at home because it rained. Someone invited him to dinner. He replied, “As I am ill, I won’t go out”. After he had hung up, he smiled, “I can’t see anything for the fog in fact”. I said, “Since you insist, I have to cook for you ”.
*句中to buy a very good camera是动词不定式短语作定语，修饰no place。
7. She decided to buy a digital camera online so that it could be sent to her.
她决定在网上订购一个数码相机，那样便可以邮寄给她。
句中so that意思是“以便，为了 ”，常常引导结果状语从句。“so (such) …that”引导结果状语从句，作“这么……，以至”或“所以”解，so接形容词、副词或分词，而such则接名词。如：
Wan Jun does exercises everyday so that she could run fast.
万军每天做练习，以便能跑得快。
Wan Jun was such a fast runner that he could almost catch up with a deer. = Wan Jun ran so fast that he could almost catch up with a deer.
万军跑得这么的快，以至于他的速度几乎能赶上鹿。
8. She had searched the Internet for two hours…
had searched 是过去完成时。
过去完成时的构成：过去完成时由“助动词had（通用于各种人称和数）+过去分词构成。
过去完成时的用法：过去完成时表示在过去某一时间或动作之前已经发生或完成了的动作。它表示动作发生的时间是“过去的过去”。用by、before等构成的短语。
9. Mr Sato looked at the ad.
ad是缩短词，也可写成advertisement，常见的缩短词还有：dormitory — dorm（宿舍）, popular — pop（流行音乐）, refrigerator — fridge（冰箱）等。
10. Then he found ads for other cameras as well.
句中as well意思是“亦；也；又；同样”。as well as 引导比较状语从句，意思是“和……做得同样好；和……一样”，as well as里的well是副词，作“好”解。
11. …all the information about different kinds of cameras…
different kinds of 不同种类的，表达“……这（几）种”可用以下组合：
this kind of + 名词原形 + 动词单数
these kinds of 名词原形/名词复数 + 动词复数
名词复数 + of this kind + 动词复数
12. click on the screen 点击屏幕
13. A week later Miyoko received the camera she had ordered.
she had ordered在这里修饰the camera，指她所订购的那台相机。
14.The computer cost so much that she didn’t buy it. 这台计算机太贵一直她买不起。
句中的cost表示“花钱”，花费，付出(只能用于钱、精力、生命等；主语必须是物。)
The book cost me five yuan. 我花五元钱买了这本书。
像take，spend，pay也都表示“花钱”这一用法，但句型不同：take的主语是动词不定式；spend，在主动语句中主语是人；pay的主语是人。be worth是“值得……的”的意思，be worth后接宾语。