Highlight all of the transitional words and phrases in the following paragraph.

since kara's class was having a bake sale, she decided to make cookies. first, she located her secret family recipe. then, she looked in her pantry and refrigerator for all the necessary ingredients. at first, she thought she had forgotten to buy flour at the store last week; however, she was relieved when she found it on the bottom shelf of her pantry. after letting the butter soften for an hour and heating up the oven, kara was finally ready to begin making cookies.