16.

1. At a garage.
2. In a restaurant.
3. In a shop.
4. In a clinic.

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17.

1. She generally doesn't allow people to borrow it.
2. She is trying to sell it.
3. She bought it from a friend.
4. It has broken down before.

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18.

1. The woman could probably repay it herself.
2. It's rather small.
3. It probably won't cost a lot to repair.
4. It's probably difficult to drive.

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19.

1. He only works on new cars.
2. He has fixed her car before.
3. He is one of her neighbors.
4. He will probably overcharge her.

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20.

1. Take the woman to her home.
2. Test-drive the woman's car.
3. Help the woman pay the mechanic's bill.
4. Help the woman fix her car.

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