Since he promised to do so, I presume he will come.

think
guess
suppose
believe

The correct answer is: C. suppose

To suppose something is to assume that it is true, without having any proof. In this case, the speaker is assuming that the person will come because they promised to do so.

The other options are:

  • Think means to have an opinion or belief about something. In this case, the speaker is not expressing an opinion, they are making an assumption.
  • Guess means to form an idea about something without having any evidence. In this case, the speaker does have evidence (the person’s promise) to support their assumption.
  • Believe means to accept something as true. In this case, the speaker is not certain that the person will come, they are simply assuming it.

I hope this helps! Let me know if you have any other questions.