This question seems to be incomplete. However, there is enough information to find the right answer.
Answer:
1. He must be here. I can see his car in front of the building.
2. They may be coming tomorrow.
3. I might not pass the exam. I don't feel very confident.
4. I could become a millionaire!
5. She can´t speak French very well. She's only lived in Paris for
a few weeks.
6. My key's not in my pocket or on my desk so it must be in the drawer.
7. Mark can´t be abroad.
8. You got the job? That's great. You must be delighted
Explanation:
Modal verbs are used for deductions. Which one we use depends on how certain we are about the possibility of something happening
We use must when we feel sure that something is true or it's the only realistic possibility.
We use might, may, or could to say that we think something is possible but we're not sure. May is more formal than might and could.
We use can't when we feel sure that something is not possible.
These verbs, like all modal verbs, are followed by an infinitive without to.
