1. I love Thai food , but I didn't used to like spicy food → use

2.He can driver a bicycle with his hand off the handle bars→ ride 

3.We used to walk miles to school every day due to lack of public transport→ a lack

4. You are not allowed to drive faster than the number on a limit speed sign  → of the limit speed signs

5. It about 1137 kilometres from Ha Noi to Ho Chi Minh city → It's

6 .Bicycles are a cheap and efficient mean of transport → cheap

7 .A sign with in a red triangle will warn people for some thing→ about

8 Be careful when you are on roads . You must drive fast or carelessly→ slow

==>

1 I love Thai food , but I did not used to like spicy food

=> use

2 He can driver a bicycle with his hand off the handle bars

=> drive

3 We used to walk miles to school every day due to lack of public transport

=> câu này có vẻ đúng 

4 You are not allowed to drive faster than the number on a limit speed sign

=> câu này có vẻ đúng

5 It about 1137 kilometres from Ha Noi to Ho Chi Minh city

=> thiếu. Sửa: It takes about 1137 kilometres from Ha Noi to Ho Chi Minh city

6 Bicycles are a cheap and efficient mean of transport

=> bỏ "a"

7 A sign with in a red triangle will warn people for some thing

=> bỏ "in" và "will"

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

=> must not