2 Complete the sentences with one word in each gap. 1 I didn't to worry about exams, but now I do because I need to get the best grades possible. 2 When Jim gets home, he start doing his homework until he has something to eat. 3 Our Science teacher always tell us to be careful when we do experiments using chemicals. 4 Cathy isn't committed to her studies. She always chatting to her friends online for hours instead of doing her homework. 5 you use to study a lot when you were at school, Grandpa?' 'Of course! I was an excellent student.' 6 When she was a teacher, she correct homework every day after school and at the weekend.