Verb conjugation of "chirp" in English

Work was performed only in June, July, August and September. In October and November, Erik has been waiting for Katja's visit and Sabine was on maternal leave after Christmas and New Year.
Take your time to answer me, do the vocabulary exercises and measure your progress! Your answers will be kept in the system itself. After that you can look at the statistics. That's pretty cool here.
That is a beautiful name you have got. It would be very helpful if you answered my mail before next week because I will have my final test on Wednesday. I will understand if you won't be able too.