Помогите пожалуйста с задание под номером 1

1)We (to walk) ten kilometres. 2)We (walk) for three hours. 3)Cuckoos (not, build) nests. They (use) the nests of other birds. 4)I am on a diet, I (to eat) nothing but apples for the whole week. 5) He usually (drink) coffee but now he (drink) tea. 6) Tom and Ann (have) a long conversation. I wonder what they (to talk) about. 7) I won't go out now as it (to rain) since early morning and I (to have) no umbrella. 8) Tom can't read the newspaper at the moment because his mother (to read) it. 9) The student (to work) very well this term.10) You (believe) all that the newspapers say? – No, I (not, believe) any of it. – Then why you (read) newspapers? 11) I (to work) with him for ten years and he never (to say) "Good morning" to me. 12) You (to hear) the news? Tom and ann are engaged. 13) Your hands are so dirty. What you (to do) all this time? 14) What you (to think) of? - I (to think) of the holidays. 15) What time the train (to arrive)? - It (to arrive) at three tomorrow.

1) I went into the church with a lot of other little girls and sat in the corner.
2) Every Sunday he went to church.
Задание: Нужно объяснить написание артикля the перед словом church. Почему в первом случае артикль есть, а во втором нет? Помогите пожалуйста, заранее благодарна.