Answer question ,no. 9 this should be answered by only experts

9. Fill in the blanks with appropriate modals: 
a. We ....... obey our teachers. (have to, must)
b. She ......... pass this time. (ought to, has to) 
c. He ......... not buy a car. (has to, need)
d. He works hard lest he ......fail. (should, have to)
e. Do you ....... cook your own meal? (should, have to)