Verb Tenses Quiz

I think that the page has some kind of error, but as you can see all my answers were CORRECT, even when the page says I'm not

1. What do you do every day? Answer: I _____ every day. (Answer: I do a pushup every day. Use the phrase do a pushup, did a pushup, etc. in ALL your answers.)
I do a pushup every day ... INCORRECT
(The correct answer was do a pushup)
2. What did you do yesterday? Answer: I _____ yesterday.
I did a pushup yesterday ... INCORRECT
(The correct answer was did a pushup)
3. What will you do tomorrow? Answer: I _____ tomorrow.
I will do a pushup tomorrow ... INCORRECT
(The correct answer was will do a pushup)
4. What are you doing right now? Answer: I _____ right now.
I am doing a pushup right now ... INCORRECT
(The correct answer was am doing a pushup)
5. What were you doing at this time yesterday? Answer: I _____ at this time yesterday.
I was doing a pushup at this time yesterday ... INCORRECT
(The correct answer was was doing a pushup)
6. What will you be doing at this time tomorrow? Answer: I _____ at this time tomorrow.
I will be doing a pushup at this time tomorrow ... INCORRECT
(The correct answer was will be doing a pushup)
7. What have you done every day for the last week? Answer: I _____ every day for the last week.
I have done a pushup every day for the last week ... INCORRECT
(The correct answer was have done a pushup)
8. What had you done before you went to bed last night? Answer: I _____ before I went to bed last night.
I had done a pushup before I went to bed last night ... INCORRECT
(The correct answer was had done a pushup)
9. What will you have done before you go to bed tonight? Answer: I _____ by the time I go to bed tonight.
I will have done a pushup before I go to bed tonight ... INCORRECT
(The correct answer was will have done a pushup)
10. What are you doing? Answer: I _____.
I am doing a pushup ... INCORRECT
(The correct answer was am doing a pushup)
11. How long have you been doing that? Answer: I _____ for ten seconds.
I have been doing a pushup for ten seconds ... INCORRECT
(The correct answer was have been doing a pushup)
12. What were you doing before you started this quiz? Answer: I _____.
I was doing a pushup before I started this quiz ... INCORRECT
(The correct answer was was doing a pushup)
13. How long had you been doing that? Answer: I _____ for ten seconds.
I had been doing a pushup for ten seconds ... INCORRECT
(The correct answer was had been doing a pushup)
14. What will you be doing before you take this quiz again tomorrow? Answer: I _____ before I take this quiz again tomorrow.
I will be doing a pushup before I take this quiz again tomorrow ... INCORRECT
(The correct answer was will be doing a pushup)
15. How long will you have been doing that? Answer: I _____ for ten seconds (before I take this quiz again tomorrow).
I will have been doing a pushup for ten seconds (before I take this quiz again tomorrow) ... INCORRECT
(The correct answer was will have been doing a pushup)

I got 15 out of 15 :)