If the sentence is correct, put +. If it is

If the sentence is correct, put +. If it is wrong, correct it.
1. Hannah likes going to parties and communicating with other people.
2. John gets ready for the final exam at the moment. Dont disturb him.
3. Nicola is staying with her host family this summer.
4. In Russia young people usually are entering university at 17 or 18.
5. She never misses her classes.
6. I am sharing my room with 3 other girls.
7. Our university has a lot of students clubs.