There are a lot of new students in / of / on school что правильно ?

Правильно будет "in school"

There are a lot of new students of school

Слова : work, be,do , help , get up , take(2) , go .
2 The doctor gave me some pills. l HAVE TO TAKE
_ them threE times a day.
3 Thanks for a lovely evening! We _HAVE TO GO_ now or we`ll miss our bus.
4 Mary’s in a panic. She _HAS TO BE__at the airport
at 2.30. but it's 2.00 and she isn’t ready yet.
5.Sorry l can’t come to your party. I_HAVE TO WORK_ till
late on Saturday.
6. ' I don't want to take exams .' 'You _HAVE TO TAKE_ them . You have no choice. 
7. I'm going to bed now . I _HAVE TO GET UP__ early tomorrow morning.
8.Harry's unemployed . he _HAS TO FIND?_ a job as soon as possible .
9._DO_I _HAVE TO DO_ this exercise ? It's really boring .

Слова : work, be,do , help , get up , take(2) , go .
2 The doctor gave me some pills. l HAVE TO TAKE
_ them threE times a day.
3 Thanks for a lovely evening! We _HAVE TO GO_ now or we`ll miss our bus.
4 Mary’s in a panic. She _HAS TO BE__at the airport
at 2.30. but it's 2.00 and she isn’t ready yet.
5.Sorry l can’t come to your party. I_HAVE TO WORK_ till
late on Saturday.
6. ' I don't want to take exams .' 'You _HAVE TO TAKE_ them . You have no choice. 
7. I'm going to bed now . I _HAVE TO GET UP__ early tomorrow morning.
8.Harry's unemployed . he _HAS TO FIND?_ a job as soon as possible .
9._DO_I _HAVE TO DO_ this exercise ? It's really boring .