Task 3. Underline the correct preposition. 1. James has parked his car in / on the corner of Nicolson and Smith street.
2. I know we are at / in a hurry, but can you slow down, please?
3. The fire left half of the buildings at / in ruins.
4. Harry grew up on/in a farm
5. Susan can't do her Maths homework because she's left her book at / in school.​

1. James has parked his car on the corner of Nicolson and Smith street.

When we talk about the position of something, we usually use the preposition "on" to indicate that something is on a surface or a specific point. In this case, James has parked his car on the corner of Nicolson and Smith street, indicating that the car is physically on the corner.

2. I know we are in a hurry, but can you slow down, please?

In this sentence, the correct preposition is "in." When we talk about being in a hurry, it means that we are experiencing a state or condition of hurry, which doesn't have a specific location but rather a general feeling or situation.

3. The fire left half of the buildings in ruins.

Here, the correct preposition is "in." We use the preposition "in" to indicate that something is contained or exists within a certain state or condition. In this case, the fire left the buildings in a state of ruin.

4. Harry grew up on a farm.

In this sentence, the correct preposition is "on." We use the preposition "on" when we want to indicate a position or location on a surface or area. In this case, Harry is indicating that he grew up physically on a farm.

5. Susan can't do her Maths homework because she's left her book at school.

Here, the correct preposition is "at." We use the preposition "at" to indicate a specific location or place. In this case, Susan has left her book at school, indicating that her book is physically located in the school.

Remember that prepositions indicate the relationship between two words or elements in a sentence, such as position, direction, or time. The choice of preposition depends on the specific context and meaning of the sentence.