The data that you ask (is, are) already here.

• is

• are

The gymnasium of our school (has, have) basketball, badminton, and volleyball facilities.

• has

• have

The doctors' analyses on my grandpa's sickness (differ, differs) from each other.

• differ

• differs

The doctors' analyses on my grandpa's sickness (differ, differs) from each other.

• differ

• differs

The research appendix (cover, covers) a lot of information making the research valid.

• cover

• covers

Common examples of natural phenomena (include, includes) lightning, earthquakes, tsunamis, volcanic eruptions, tornadoes and the like.

• include

• includes

The teacher's syllabus (contain, contains) topics divided per unit and the related resources about the topic.

• contain

• contains

Social media (has, have) made a great impact in the lives of every individual.

• has

• have

Some of my mom's cacti (look, looks) more attractive than the rest because they have flowers.

• look

• looks

The book's index this year (include, include) more words compared to the one we used a few years ago.

• include

• includes