Расположите пропущенные предложения в таком порядке, чтобы получился связный текст
Pedro Fernandez: Bike Maker
When I choose a material for a bike frame, I have to think about the properties of the material. How elastic is it? If you bend or stretch it, will it go back to its original shape? If it does, it has high elasticity. How strong is it? There are two types of strength. The first is how much force you need to bend it to a point where it can’t go back to its original shape. 1 _______. Steel is the least expensive choice. There’s a wide range of standard gauge tubes available. It’s strong and it has good elasticity but it’s heavy.
Aluminium is light and strong but it’s flexible. The more it bends, the quicker it breaks. 2 _______. That limits the amount of bending.
Titanium has a great strength-to-weight ratio. It’s got good elasticity so when it bends to return to its original shape. 3 _______. But it’s expensive-fifteen times the price of steel!
The professionals use carbon fibre. It’s very light and it’s very strong. You can shape it any way you like. 4 _______.
The second is the amount of force you need to break it.
So aluminium bike frames use large diameter tubes.
It’s corrosion-resistant so you don’t need to paint it.
But carbon-fibre frames are hand-made so they’re very expensive.