Combine the following pairs or groups of sentences, using relativepronouns?

Combine the following pairs or groups of sentences, using relative pronouns. - My grandmother is 90 years old. She has never been ill. - The Earth is a planet. It moves round the sun. - This is the place. We should build our house here. - Mary loves studying. She is my younger sister. - . I work for a firm. This firm makes cars. - . I met an old lady. Her dog had disappeared. - A grocer's is a shop. You can buy fruit there. - In February we’ll be very busy. It’s the shortest month.