Put the verbs in the correct form.
1. The students always _______ (check up) their tasks in class.
2. The professor _______ (check up) the papers after the exam.
3. He _______ (check in) and went to buy a newspaper.
4. She _______ (check in) when she comes to the airport.
5. You should _______ (check out) before 11 a.m.
6. He _______ just (check out) and is running after the bus.
7. Find the books on the Internet and _______ (check off), then I'll buy them.
8. They _______ (check off) the dishes and waited for the waiter to come.