Answer :
The correct answers are:
- Have planned: Since "Scuba divers" is a plural subject, Have planned is the only fitting option.
- Have: Considering "June Walters and her friend" is a plural subject and the blank space is followed by a verb in simple past form (baked), the root verb have is fitting for both cases.
- Were: Once again, "Light and heat" is a plural subject, hence the only fitting option is were.