There is one mistake in each sentence

IV. There is one mistake in each sentence. Find and correct it.

1. I love Thai food now, but I didn’t used to like spicy food.

2. We use to walk miles to school every day due to lack of public transport.

3. It about 1137 kilometres from Hanoi to Ho Chi Minh City.

4. Be careful when you are on roads. You must drive fast or carelessly!