Jawaban:

1. The social function of introducing oneself is to provide information about one's identity and to initiate social interaction with others.
2. In this context, the social function of Rania's greeting, "Hi, how do you do?" is to initiate social interaction with Susi and to show politeness.
3. The social function of congratulating and complimenting someone is to show appreciation and support for their achievements or positive qualities.
4. Some expressions of congratulating someone include: "Congratulations on your success!", "Well done!", "I'm so proud of you!"
5. A. "I am going to do homework tonight." B. "Shella is following the math seminar."
6. A synonym for "be going to" is "will".
7. A descriptive text is a type of written text that describes a person, place, thing, or event in detail.
8. The generic structure of a descriptive text typically includes an introduction, a series of body paragraphs, and a conclusion.
9. Some language features of a descriptive text might include the use of adjectives to describe the qualities of the thing being described, the use of sensory language to describe the thing's appearance, and the use of verb phrases to describe the thing's actions or characteristics.
10. Some possible titles for a descriptive text might include "A Day at the Beach", "My Favorite Restaurant", or "The Beauty of Autumn".