A

What problems do the teenagers probably have? Here is a survey showing their main problems．

(     )21． How many main problems are there in the survey?

请根据以下的内容提示写一篇题为“(:hanges in Our Hometown”的短文。字数80左右。过去：旧房，河水肮脏，步行，骑自行车；现在：高楼，河水清澈，乘公交车，小汽车。

40．I don’t know what l should do next．（改为简单句）

I don’t know_____ _____ _____next．

38． My little brother used to be afraid of the dark．（改为反意疑问句）

My little brother used to be afraid of the dark，_____ _____?

39．The old man slept． The door was open．（合并为一句）

The old man slept _____the door _____．

36． We were surprised that the little girl could work out the difficult math problem．（改为同义句）

_____ _____ _____ ，the little girl could work out the difficult math problem

35．我认为这件连衣裙尽管今年过时了，但看上去仍然很漂亮。

l think this dress _____ looks perfect _____ _____it has gone out this year．

37． Ann has decided to be a great inventor when she grows up．（改为同义句）

Ann has _____a _____to be a great inventor when she grows up．

34．她过去参加的是游泳队，但是现在她进了足球队。

She_____ _____ be on the swim team，but now she is on the soccer team．

33．家长们对孩子的成功感到自豪。

The parents_____ _____ _____ the success of their children，

31．那个孩子害怕一个人被留在屋子里。

The child _____ _____ _____being left alone in the house．