Choose can or can't according to the situation

Gap-fill exercise
By Nacho Montorio

Fill in all the gaps, then 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!
1. She answer the phone now; she's not at home.
2. I know the answer; I answer the question.
3. She is good at piano; she play the piano very well.
4. This test is very difficult; I answer any question.
5. Maria can speak English but she speak French.
6. Juan play tennis very well; he is a good tennis player.