Complete the sentences with the correct form of the verbs in brackets. Use have to or not have to.

People don't have to vote (not vote) in my country.

A Jenny's room is always tidy. Jenny's parents  1 ________ (not clean) it because she always does it.
B I 2 ________ (finish) this project by Monday. It's really important but I 3 ________ (not do) it alone. You can help me.
C Steven is very clever. He 4 ________ (not study) a lot but he 5 ________ (do) his homework every week. His teacher is strict about it.