1.My teeth are sensitive to sugary food.
2.（2019天津改编）You are required to submit (submit) a final draft of your essay on March 9.
3.Only when we realize the importance of helping each other can we build a harmonious (harmony) society.
4.（2020课标全国Ⅰ）There are three books I reread annually (annual).
5.I feel honored to deliver a speech here on behalf of the whole students of our school.
6.The baby underwent (undergo) a life-saving brain operation last week.
7.They have been working hard for days in search of a better way to solve the problem.
8.The researchers are exploring why dinosaurs died out suddenly about 65 million years ago.
