Answer:
1) should
2) must
3) should
4) have to
5) should
6) must
7) should
8) have to
9) should
10) should
11) must
12) should
Explanation:
if you use should then it's applying that you should do something but you don't have to; not required to do.
if you use have to its applying that you absolutely have to do it; required
if you use must then it's applying that your allowed to do it