Use must,should or have (got) to-Grammar

[aknj]

السلام عليكم
عندي سؤال ابغي حلها وتفهموني ليش اخترتوها
Use must,should or have (got) to
Doctors often ................. work for long hours.
Clara likes her job becouse she .......... work in the school holiday
You ............ try to speak English as mush as possible
In a restaurant , people .......... talk loudly