`1`. It's not a good idea to use the village's land to build new roads. (wouldn't)

=> I wouldn't use the village's land to build new roads if I were the president.

`2`. You should visit the historical places of the area. (worth)

=> It is worth visiting the historical places of the area.

It + to be + worth + Ving: đáng để làm gì.

`3`. He suggested seeing Trang An, a natural wonder of our area. (visit)

=> What about visiting Trang An, a natural wonder of our area ? - he said.

`4`. The sleepy villages are expected to mushroom into crowded towns within two years. (supposed) 

=> The sleepy villages are supposed to mushroom into crowded towns within two years.

Suppose: dự đoán

`5`. It is important to educate children to preserve traditional values. (necessary)

=> It is necessary to educate children to preserve traditional values.

Necessary: cần thiết

1 I wouldn't use the village's land to built new road if I were the president

2 It is worth visiting the historical places of the area 

3 What about visiting Trang An , a natural wonder of our area?

4 the sleepy villages are supposed to mushroom into crowded towns  within two years

5 It is necessary to educate children to preserve traditional values

Theo mik là như v á

Xin hayy nhất ạ.Thanks^_^