Here are the completed sentences with the best adverbs:

1. Come here **quickly**. You have to see this!
2. We knew that she had got the job when we saw her **happily** talking on the phone.
3. He **accidentally** put the vase on the table. It fell to the floor.
4. Sharon is throwing a party on Saturday. She **just** finished her PhD.
5. Let's walk **slowly**. I don't want to be the first one at the meeting.
6. Alex **successfully** put up the bookshelf. It was too difficult for me to do on my own.
7. Everything happened so **quickly**. We had to move to California in less than a month.
8. Why does he always have to talk so **loudly**? You can hear him in the next room!
9. Although she speaks five languages, she did not do **well** on the translation exam.
10. I was so surprised. His new apartment was **beautifully** decorated.