Ayuda Combine the following pairs or groups of sentences, using relative pronouns?

Ayuda 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.