I gain a lot of rewarding experiences from some social activities. Our local Community Youth Club is a very popular organization with young people in my town. I have been a member for four years now and I've taken part in a lot of interesting projects,____include fun activities such as holiday camps and discos. We have organized sports competitions and we have even made a video.

    But it isn't all just enjoyment, we have also started doing social work to help people in our neighborhood. We____(organize) activities for small children during the holidays. We have also formed a special support group to help young people stop____(smoke).

    We are particularly proud of the most recent group we have created. It organizes regular visits____the local old people's home. My class spent an afternoon at a home and everyone found the visit very rewarding. The old people there were____(talk) and they told us their personal stories____(cheer) .

    During our visit, the home was filled with ____(laugh). But we realized that life wasn't always easy .Some of them were in poor health and were very

____ (happy).

    Many young people like me do not live with our grandparents and we have little contact with elderly people. As a result, many young people don't know____

    they are like. After this visit, my friends and I decided that we should do____to help improve the quality of their lives.

2＋4＋2＝（    ）。

如图中a表示垂直于纸面的一根导体，它是闭合电路的一部分，它在磁场中如图中所示的方运动时在哪种情况下会产生感应电流？（　　）

阅读所给图片，完成问题。