Here’s a possible way to fill in the blanks:

1. I wanted to go to the party, **however** I had to study for my exam.
2. She loves to travel **and** try new foods.
3. He didn't have any cash, **so** he had to use his credit card.
4. She needs to exercise regularly **because** she wants to stay healthy.
5. I love ice cream, **but** I’m lactose intolerant.
6. He wants to go to the beach, **but** it’s too far from his house.
7. She forgot her phone at home; **therefore**, she couldn't call her friend.
8. I can't decide what to wear; **otherwise**, I would have been ready by now.
9. He needs to finish his homework; **otherwise** he won't be able to watch TV.
10. The restaurant was busy; **thus**, we decided to go to a different one.
11. I want to go to the beach; **however**, it’s raining.
12. She wants to go on vacation to Hawaii; **but** she may choose to go to Mexico instead.
13. He didn't like the movie, **so** he left early.
14. He's not feeling well; **therefore**, he will have a day off.
15. She likes to read books; **moreover**, she also likes to write her own stories.