Помогите решить упражнение по английскому

1. I have traveled to several countries in Europe.
2. Will has been working on the project since morning.
3. They have been playing tennis for two hours.
4. My friend and I have just finished watching the film.
5. Carl has been learning to play the guitar for a month.

1)I .have travelled..... to several countries in Europe (to travel)
2)Will ...has been working... on the project since morning (to work)
3)They ...have been playing... tennis for tWo hours (to play)
4)My friend and I ...have ... just ...stopped... watching the film (to watch) /...have just watched...здесь напрашивается глагол stop,а его нет.
5)Carl ....is learning.. to play the guitar for A month (to learn)