0016 ｜ promise
To promise is to say you will do something for sure.
→ He promised to return my key by tomorrow.
0017 ｜ reply
To reply is to give an answer or say back to someone.
→ She asked him what time his meeting was. He replied, "at three."
0018 ｜ safe
When a person is safe, they are not in danger.
→ Put on your seat belt in the car to be safe.
0019 ｜ trick
A trick is something you do to fool another person.
→ His card trick really surprised us.
0020 ｜ well
You use well to say that something was done in a good way.
→ The couple can dance quite well.