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2. To be worthwhile, you need an average wind speed of around 25 km/h.
- Do you need an averae wind speed of around 25 km/h, to be worthwhile?
- To be worthwhile, do you need an average wind speed of around 25 km/h or 30 km/h?
- What wind speed do you need?
- You need an average wind speed of around 25 km/h, don't you?

1. We can use the energy in the wind by building a tall tower, with a large propeller on the top.
- Can we use the energy in wind by building a tall tower, with a large propeller on the top?
- Can we use the energy in the wind by building a tall tower, with a large or small propeller on the top?
- What can we use by building a tall tower?
- We can use the energy in the wind by building a tall tower, with a large propeller on the top, can't we?

мозги в отключке ))

1. Do you need an average wind speed of around 25 km/h to be worthwhile?
Do you need an average wind speed of 25 or 30 km/h to be worthwhile?
What speed do you need to be worthwhile?
To be worthwhile you need an average wind speed of around 25 km/h, don't you?

2. Can we use the energy of the wind by building a tall tower with a large propeller on the top?
Can we use the energy of the wind or of the sun by building a tall tower with a large propeller on the top?
What can we do to use the energy of the wind?
We can use the energy of the wind by building a tall tower with a large propeller on the top, can't we?

What kind of an average vind speed do you need to be worthwhile?
Do you need an average wind speed of around 25 or 20 km/h to be worthwhile?
Who needs to reach a wind speed of around 25 km/h?
To be worthwhile, you need an average wind speed of around 25 km/h, aren't you?

Can we use energy in the wind....
Can we use energy in the wind by building a tall tower or a small building...?
What kind of tover do we need to use the energy?
We can use the energy in the wind by building a tall tower, with a large propeller on the top, are we?

Довольно странные предложения для такого задания...

1 Are you needing an average wind speed of around 25 km/h To be worthwhile?
2. Are you needing an average wind speed of around 25 km/h To be worthwhile or no?
3. with what speed can you need to be worthwhile?
4. Are you needing an average wind speed of around 25 km/h To be worthwhile or 38 km/h?

Извините, конечено, но ваш ответ совсем неправильный. Я имеюю в виду ответ поьзователя Папараци.