Present Verb Forms
Use the verb forms to complete the text. Do not use a verb form more than once.
Press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue.
Note that you will lose points if you ask for hints or clues!
has has been working on has built hasn't finished is working