.________ into use in April 2000,the hotline was

service hotline
服务热线
例句
Perfect service system, 24-hour service hotline ready to answer yourphone.
完善的服务体系,24小时服务热线随时准备接听您的电话.

A.Put.put…into use将…投入使用.the hot line(热线)是在2000年四月被投入使用的,所以用过去分词作状语、表示已经发生的被动动作.putting、having put分别是现在分词的一般式和完成式,都是主动意义.而being done现在分词的被动式表示被动与正在进行,一般置于句首,表示原因.如：Being chased by some spies,he hid himself in the grass. 还可以作后置定语,修饰某一名词,表示某一被动动作正在进行.如：The meeting being held now is of great importance. 现在正在开的会很重要.

C

Dear Maria,
There are lots of things you can do to help you sleep well, so you needn’t worry about it. You can often play with your friends, listen to some soft music, or read some interesting books. Or maybe you can talk with your parents about your problems, and they will help you with it.
Yang Hao

选择 must be

这两道题目是同一个类型的.你要弄清楚的是：being done 是“正在被做”的意思.所以,第一题,如果选D的话,那就要翻译成：在2000年4月正在被投入使用.而其实,非谓语作状语,你只需要考虑,the hotline 与 put 的关系是被动的,就用过去分词.第二题,同理.he 和invite 是被动的.如果选C的话,就要翻译成：即使正在被邀请,他也不会去的.

 
I have knew about your problem. I have some advic to help you. First, I think you should study hard. If you pay attention to your study , you’ll have less time to worry about other things. Secondil, to keep in good health, you have to do more ssports. Also, it is important to have a balanced diet. Besides those, you must have at least eight hours’ sleep every night. Enough sleep can lead to good grades. At last ,you can talk with your parents about your problem. Maybe they have good advice for you, After all, they have been young and experinced the same thing.

有两种表达法：
24-hour hotline
24 hours' hotline [ 注意：不要漏掉 s 后面的 ' ]

We get many calls from our schoolmates. They have different problems.
A girl named Mary says there are many rules in her family. For example, she has to do a lot of housework after school. Tom and his parents differ in their wishes about his future.
Firstly I have some suggestions for Mary. From your call, I know you don’t approve of your family rules. I suggest that you have an honest talk with your parents because if you exchange opinions, then you will understand each other better. As for Tom, I think you can tell your parents what you are interested in and tell them interest is the mother of success and you will try your best to achieve your goal. I believe they will agree with your opinion sooner or later. Good luck!